CVE-2025-30561: CAS Maestro CSRF Vulnerability

CVE-2025-30561 Overview

A Cross-Site Request Forgery (CSRF) vulnerability exists in the CAS Maestro WordPress plugin developed by Henrique Mouta. This security flaw enables attackers to chain CSRF with Stored Cross-Site Scripting (XSS), allowing malicious actors to trick authenticated administrators into performing unintended actions that inject persistent malicious scripts into the plugin's configuration.

Critical Impact

Attackers can exploit this CSRF vulnerability to inject stored XSS payloads, potentially leading to session hijacking, privilege escalation, administrative account compromise, and malware distribution to site visitors.

Affected Products

• CAS Maestro WordPress Plugin version 1.1.3 and earlier
• WordPress sites utilizing CAS (Central Authentication Service) integration via cas-maestro
• All installations with CAS Maestro versions from initial release through 1.1.3

Discovery Timeline

• 2025-03-24 - CVE CVE-2025-30561 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-30561

Vulnerability Analysis

This vulnerability combines two distinct attack vectors into a dangerous exploitation chain. The CAS Maestro plugin fails to implement proper CSRF token validation on sensitive administrative forms, allowing attackers to craft malicious requests that bypass the expected Same-Origin Policy protections. When an authenticated administrator is tricked into visiting a malicious page or clicking a crafted link, the attacker's request executes in the administrator's session context.

The vulnerability is particularly severe because it enables Stored XSS as a secondary payload. Rather than simply performing a one-time malicious action, attackers can inject persistent JavaScript code into the plugin's configuration fields. This stored payload then executes every time an administrator accesses the affected settings page, or potentially when any user interacts with CAS-integrated login functionality.

Root Cause

The root cause of this vulnerability is the absence of CSRF protection mechanisms (such as nonce verification) on plugin configuration forms combined with insufficient input sanitization. WordPress provides built-in functions like wp_nonce_field() and wp_verify_nonce() for CSRF protection, but the CAS Maestro plugin fails to implement these security controls on affected administrative actions. Additionally, user-supplied input is not properly escaped before being stored in the database, enabling the Stored XSS component.

Attack Vector

The attack exploits the lack of CSRF protection by crafting a malicious HTML page containing a hidden form that targets the CAS Maestro plugin's settings endpoint. When an authenticated WordPress administrator visits the attacker's page, JavaScript automatically submits this form to the vulnerable endpoint. The form includes XSS payload data that gets stored in the plugin's configuration.

The exploitation requires social engineering to lure an authenticated administrator to a malicious page. This can be accomplished through phishing emails, malicious advertisements, compromised third-party websites, or any method that causes the victim to load attacker-controlled content while authenticated to the WordPress dashboard. Once the stored XSS payload is injected, it persists in the database and executes on subsequent page loads, potentially affecting all administrators and users who interact with the affected functionality.

Detection Methods for CVE-2025-30561

Indicators of Compromise

• Unexpected JavaScript code or <script> tags in CAS Maestro plugin configuration values
• Unusual administrative activity in WordPress logs without corresponding legitimate administrator actions
• Modified plugin settings that administrators do not recall changing
• Reports of unexpected popups, redirects, or behavior on CAS login pages

Detection Strategies

• Review the wp_options table for CAS Maestro-related options containing suspicious HTML or JavaScript content
• Monitor WordPress admin action logs for settings changes to the CAS Maestro plugin
• Implement Content Security Policy (CSP) headers to detect and block unauthorized inline script execution
• Deploy Web Application Firewall (WAF) rules to identify CSRF attack patterns targeting WordPress admin endpoints

Monitoring Recommendations

• Enable comprehensive logging for all WordPress administrative actions using security plugins
• Configure alerts for modifications to plugin settings, particularly for plugins handling authentication
• Regularly audit stored configuration values for signs of XSS injection
• Monitor HTTP referrer headers for administrative form submissions originating from external domains

How to Mitigate CVE-2025-30561

Immediate Actions Required

• Disable or remove the CAS Maestro plugin if not critical to operations until a patched version is available
• Review and sanitize all CAS Maestro plugin configuration values for malicious content
• Implement additional WAF rules to block CSRF attacks targeting the WordPress admin panel
• Warn administrators to exercise caution when clicking links or visiting external sites while logged into WordPress

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should monitor the Patchstack Vulnerability Report for updates on remediation steps. If the plugin is no longer maintained, consider migrating to an alternative CAS integration solution with active security support.

Workarounds

• Implement server-level CSRF protection using web server configuration or security modules
• Restrict access to the WordPress admin panel to trusted IP addresses only
• Use browser extensions or policies that prevent automatic form submissions from untrusted origins
• Apply manual nonce verification at the web server level for requests to the CAS Maestro settings endpoints

# Example .htaccess rule to restrict WordPress admin access by IP
<Files wp-admin>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>