CVE-2025-26888 Overview
CVE-2025-26888 is a missing authorization vulnerability in the WooCommerce Multilingual & Multicurrency (WPML) plugin developed by Amir Helzer. The flaw affects versions from an unspecified early release up to and including 5.3.8. The plugin fails to enforce proper access control checks on one or more actions, allowing unauthenticated network attackers to interact with functionality that should require authorization. The vulnerability is tracked under CWE-862: Missing Authorization and impacts WordPress sites running the affected plugin versions.
Critical Impact
Unauthenticated attackers can exploit incorrectly configured access control to modify plugin data or trigger actions without valid credentials, affecting the integrity of WooCommerce Multilingual installations.
Affected Products
- WooCommerce Multilingual & Multicurrency (woocommerce-multilingual) plugin for WordPress
- All versions up to and including 5.3.8
- WordPress sites using the plugin for multilingual e-commerce
Discovery Timeline
- 2025-04-09 - CVE-2025-26888 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-26888
Vulnerability Analysis
The vulnerability stems from broken access control in the WooCommerce Multilingual & Multicurrency plugin. One or more endpoints or AJAX actions exposed by the plugin fail to verify that the requesting user holds the required capability or role. This missing authorization check allows requests to reach protected functionality without proper validation. The issue falls into the CWE-862 category, which covers scenarios where an application does not perform an authorization check when an actor attempts to access a resource or perform an action.
The attack is executed over the network without user interaction. Successful exploitation results in a limited integrity impact, with no direct effect on confidentiality or availability of the underlying host. The EPSS probability for exploitation is 0.263% with a percentile of 17.88, indicating a relatively low likelihood of active exploitation at present.
Root Cause
The root cause is the absence of a capability check, nonce validation, or equivalent authorization gate in one or more request handlers registered by the plugin. WordPress plugins typically enforce access control using current_user_can() and check_ajax_referer() calls. When these controls are missing on state-changing endpoints, any visitor can invoke them.
Attack Vector
An attacker sends crafted HTTP requests to the vulnerable plugin endpoint on a target WordPress site. Because no authentication or privilege check occurs, the plugin processes the request as if it were authorized. The vulnerability is described in the Patchstack advisory. No proof-of-concept exploit is publicly available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
// No verified exploit code is publicly available.
// Refer to the Patchstack advisory for technical details.
Detection Methods for CVE-2025-26888
Indicators of Compromise
- Unexpected changes to language, currency, or translation settings within WooCommerce Multilingual configuration
- HTTP requests to plugin-specific AJAX actions (admin-ajax.php with wpml- or wcml-prefixed action parameters) originating from unauthenticated sessions
- Web server access logs showing repeated POST requests to plugin endpoints without valid wp_nonce parameters
Detection Strategies
- Audit WordPress access logs for anomalous request patterns targeting admin-ajax.php and REST API routes registered by woocommerce-multilingual
- Deploy a Web Application Firewall (WAF) rule to flag requests to plugin endpoints that lack authenticated session cookies
- Correlate plugin configuration changes with the user session that performed them using WordPress audit logging plugins
Monitoring Recommendations
- Enable verbose logging on WordPress administrative actions and forward logs to a centralized SIEM for analysis
- Monitor for changes to the wp_options table entries related to WPML and WooCommerce Multilingual settings
- Track outbound requests initiated by the WordPress host that could indicate secondary abuse following exploitation
How to Mitigate CVE-2025-26888
Immediate Actions Required
- Update the WooCommerce Multilingual & Multicurrency plugin to a version later than 5.3.8 as soon as a fixed release is available from the vendor
- Review the Patchstack advisory for vendor-specific remediation guidance
- Audit user accounts, plugin settings, and content for unauthorized modifications made prior to patching
Patch Information
Refer to the Patchstack advisory for the fixed plugin version and vendor patch details. Site administrators should apply the update through the WordPress plugin management console or via WP-CLI using wp plugin update woocommerce-multilingual.
Workarounds
- Deactivate the WooCommerce Multilingual & Multicurrency plugin until the patched version is installed if immediate patching is not possible
- Restrict access to wp-admin/admin-ajax.php and plugin REST routes at the WAF or reverse proxy layer to authenticated sessions only
- Apply virtual patching rules through a WAF to block requests targeting the vulnerable plugin actions
# Update the plugin using WP-CLI once a fixed version is released
wp plugin update woocommerce-multilingual
# Alternatively, deactivate the plugin as a temporary workaround
wp plugin deactivate woocommerce-multilingual
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
