CVE-2025-67994: YayCurrency Auth Bypass Vulnerability

CVE-2025-67994 Overview

A Missing Authorization vulnerability has been discovered in the YayCommerce YayCurrency WordPress plugin. This vulnerability, classified under CWE-862 (Missing Authorization), allows attackers to exploit incorrectly configured access control security levels. The flaw enables unauthorized users to perform actions that should require proper authentication and authorization, potentially leading to arbitrary content deletion within affected WordPress installations.

Critical Impact

Unauthenticated attackers can exploit missing authorization checks to access restricted functionality and delete arbitrary content, compromising the integrity and availability of WordPress sites using the YayCurrency plugin.

Affected Products

• YayCurrency WordPress Plugin versions up to and including 3.3
• WordPress installations with vulnerable YayCurrency plugin versions
• WooCommerce stores utilizing YayCurrency for multi-currency functionality

Discovery Timeline

• 2026-02-20 - CVE CVE-2025-67994 published to NVD
• 2026-02-25 - Last updated in NVD database

Technical Details for CVE-2025-67994

Vulnerability Analysis

The vulnerability stems from missing authorization checks within the YayCurrency plugin's request handling mechanisms. WordPress plugins typically implement capability checks using functions like current_user_can() to verify that users have appropriate permissions before executing sensitive operations. In this case, the YayCurrency plugin fails to properly validate user permissions before allowing certain actions to be performed.

The network-accessible nature of this vulnerability means that attackers can exploit it remotely without requiring any prior authentication to the WordPress site. The attack requires no user interaction and has low complexity, making it particularly dangerous for publicly accessible WordPress installations.

Root Cause

The root cause is CWE-862: Missing Authorization. The YayCurrency plugin does not implement proper permission checks before processing requests that modify or delete content. This allows unauthenticated users to bypass the intended access control mechanisms and execute privileged operations. The plugin's AJAX handlers or REST API endpoints likely lack the necessary check_ajax_referer() or capability verification calls that would normally prevent unauthorized access.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker can craft malicious HTTP requests directly to the vulnerable plugin endpoints without requiring any authentication credentials. The vulnerability specifically allows for arbitrary content deletion, meaning attackers can target and remove critical site content, plugin settings, or configuration data.

The exploitation flow typically involves:

1. Identifying a WordPress site running a vulnerable version of YayCurrency
2. Crafting HTTP requests to the plugin's unprotected endpoints
3. Executing unauthorized deletion operations without authentication
4. Potentially escalating the attack to cause broader site disruption

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-67994

Indicators of Compromise

• Unexpected deletion of WordPress content, posts, pages, or plugin settings
• Unusual HTTP requests to YayCurrency plugin endpoints from unauthenticated sources
• Access log entries showing requests to /wp-admin/admin-ajax.php with YayCurrency-related actions from external IPs
• Missing or modified currency configuration data within the YayCurrency plugin

Detection Strategies

• Monitor WordPress access logs for suspicious requests targeting admin-ajax.php with YayCurrency action parameters
• Implement Web Application Firewall (WAF) rules to detect and block unauthorized requests to plugin endpoints
• Use WordPress security plugins to audit plugin activity and detect unauthorized modifications
• Review server logs for patterns of repeated requests to currency-related endpoints from single IP addresses

Monitoring Recommendations

• Enable comprehensive logging for all WordPress AJAX and REST API requests
• Configure alerts for content deletion events, especially those occurring without corresponding admin user sessions
• Implement file integrity monitoring to detect unauthorized changes to plugin files or database content
• Regularly audit user activity logs for anomalous patterns that may indicate exploitation attempts

How to Mitigate CVE-2025-67994

Immediate Actions Required

• Update YayCurrency plugin to a version newer than 3.3 as soon as a patched version becomes available
• Temporarily disable the YayCurrency plugin if an update is not yet available and the functionality is not critical
• Implement WAF rules to restrict access to the plugin's AJAX endpoints
• Review recent activity logs for signs of exploitation and restore any deleted content from backups

Patch Information

Organizations should monitor the official YayCurrency plugin page on WordPress.org and the Patchstack vulnerability database for updates regarding a security patch. Ensure automatic plugin updates are enabled in WordPress or establish a process for prompt manual updates when security patches are released.

Workarounds

• Restrict access to admin-ajax.php for specific YayCurrency actions using .htaccess rules or server configuration
• Implement additional authentication layers at the web server level to protect WordPress admin functionality
• Use a security plugin like Wordfence or Sucuri to add virtual patching capabilities
• Consider implementing IP-based access restrictions for administrative endpoints if the site is managed from known locations

# Example .htaccess rule to restrict AJAX access (adjust action names as needed)
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-admin/admin-ajax\.php$ [NC]
RewriteCond %{QUERY_STRING} action=yaycurrency [NC]
RewriteCond %{REQUEST_METHOD} POST
RewriteRule .* - [F,L]
</IfModule>