Atomic Edge analysis of CVE-2026-25403 (metadata-based):
The Ultimate Store Kit – Addon For WooCommerce, EDD and Elementor plugin for WordPress, versions up to and including 3.0.5, contains a Missing Authorization vulnerability (CWE-862). The plugin, identified by the slug ‘ultimate-store-kit’, exposes a function (likely an AJAX handler or REST callback) that lacks a capability check, allowing unauthenticated attackers to invoke it. The CVSS score is 5.3 (medium) with a vector of AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N, indicating network access, no privileges, and a low impact on integrity without confidentiality or availability impact. Atomic Edge analysis infers the issue is a broken access control flaw, not a data leak or direct code execution.
The root cause is a missing permission callback or capability check in a PHP function that the plugin registers as an AJAX handler or REST API endpoint. In WordPress, such handlers commonly use hooks like wp_ajax_ and wp_ajax_nopriv_, or are registered via register_rest_route. For the nopriv action, the handler runs without authentication, and if it lacks a current_user_can() check, an unauthenticated attacker can execute the action. This conclusion is inferred from the CWE-862 classification and the vulnerability description; no source code was available for confirmation. The description specifically references ‘a missing capability check on a function’, aligning with the typical vulnerable pattern of an AJAX handler that performs a state-changing operation without authorization verification.
Exploitation requires only a crafted HTTP request to the WordPress AJAX endpoint. An attacker sends a POST request to /wp-admin/admin-ajax.php with the action parameter set to a plugin-specific AJAX hook, such as ultimate_store_kit_some_action (exact name inferred, not confirmed). The request requires no nonce, cookies, or authentication token, as the vulnerable function may also be registered for unauthenticated access via the nopriv hook. The attacker can include additional parameters that the function processes, potentially triggering the unauthorized action. Without the plugin source, Atomic Edge research cannot identify the precise action name, but the attack vector is straightforward: submit the AJAX request with the appropriate action and related parameters to the unauthenticated endpoint.
Remediation requires adding an appropriate capability check to the vulnerable function, typically using current_user_can() with the required capability (e.g., ‘edit_posts’, ‘manage_options’), or a proper permission_callback when using WP REST API. The plugin should also ensure that the handler is only registered for authenticated users unless the function is intentionally public. Developers should review all AJAX and REST callbacks to confirm they include authorization checks, and update to patched version 3.0.7 where this issue is addressed. For site administrators, updating the plugin to 3.0.7 or later is the primary fix; if immediate patching is not possible, a virtual patch via a WAF or security plugin should be applied to block unauthenticated requests to the vulnerable handler.
Successful exploitation enables an unauthenticated attacker to perform an unauthorized action with low integrity impact. The exact action remains unknown, but typical cases involve toggling settings, updating options, or modifying data that the plugin controls. The CVSS vector indicates no confidentiality impact and no availability impact, so the attacker cannot read sensitive data or cause a denial of service. This vulnerability is medium severity, but in the context of a storekit plugin, the unauthorized action might affect product display or plugin configuration, potentially misleading store visitors. The lack of authentication requirement increases the risk, as any attacker can exploit it without prior access.
