CVE-2025-23533: WP Lyrics CSRF Vulnerability

CVE-2025-23533 Overview

CVE-2025-23533 is a Cross-Site Request Forgery (CSRF) vulnerability in the WP Lyrics WordPress plugin (wplyrics) developed by zetxek. This vulnerability allows attackers to chain CSRF with Stored Cross-Site Scripting (XSS), enabling malicious actors to inject persistent scripts into the WordPress site through forged requests. When an authenticated administrator is tricked into visiting a malicious page, the attacker can execute arbitrary JavaScript code within the context of the victim's browser session.

Critical Impact

This CSRF-to-Stored XSS vulnerability chain allows attackers to persistently inject malicious scripts into WordPress sites, potentially compromising administrator sessions, stealing credentials, defacing websites, or redirecting visitors to malicious domains.

Affected Products

• WP Lyrics WordPress Plugin version 0.4.1 and earlier
• All WordPress installations running vulnerable versions of the wplyrics plugin
• WordPress sites where administrators may interact with untrusted content

Discovery Timeline

• 2025-01-16 - CVE-2025-23533 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-23533

Vulnerability Analysis

This vulnerability combines two distinct attack vectors to achieve persistent code execution within WordPress sites. The WP Lyrics plugin fails to implement proper CSRF token validation on forms that handle plugin settings or content submission. This missing protection allows attackers to craft malicious web pages that, when visited by authenticated WordPress administrators, automatically submit forged requests to the vulnerable plugin endpoints.

The secondary component of this vulnerability chain is the lack of proper input sanitization and output encoding, which allows the injected content to be stored in the database and rendered as executable JavaScript when the affected pages are viewed. This creates a Stored XSS condition that persists across sessions and affects all users who view the compromised content.

Root Cause

The root cause of CVE-2025-23533 is twofold:

1. Missing CSRF Protection (CWE-352): The WP Lyrics plugin does not implement WordPress nonce verification on state-changing operations. WordPress provides built-in CSRF protection through nonces (wp_nonce_field() and wp_verify_nonce()), but the vulnerable plugin fails to utilize these security mechanisms.

2. Insufficient Input Validation: User-supplied input is stored directly in the database without proper sanitization, and output is rendered without adequate escaping using functions like esc_html() or esc_attr().

Attack Vector

The attack vector requires social engineering to trick an authenticated WordPress administrator into visiting a malicious webpage. The exploitation flow follows these steps:

1. The attacker crafts a malicious HTML page containing hidden forms that target vulnerable WP Lyrics plugin endpoints
2. The malicious page automatically submits forged POST requests when loaded by the victim's browser
3. Since the administrator is authenticated to WordPress, the browser includes valid session cookies with the forged request
4. The vulnerable plugin processes the request without CSRF token validation
5. Malicious JavaScript payload is stored in the WordPress database
6. When any user (including the administrator) views pages containing the stored content, the XSS payload executes

The vulnerability can be exploited through crafted HTML pages that auto-submit forms targeting the plugin's unprotected endpoints. Attackers typically embed malicious script tags or event handlers within lyric content that gets stored and later rendered without proper escaping. For detailed technical information, see the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2025-23533

Indicators of Compromise

• Unexpected <script> tags or JavaScript event handlers (e.g., onerror, onload) in WP Lyrics content stored in the WordPress database
• Unusual POST requests to WP Lyrics plugin endpoints originating from external referrers
• JavaScript execution errors or unexpected redirects reported by site visitors
• New or modified plugin settings that administrators did not change

Detection Strategies

• Review WordPress database tables associated with WP Lyrics plugin for suspicious HTML or JavaScript content
• Monitor HTTP access logs for POST requests to WP Lyrics endpoints with external Referer headers
• Implement Content Security Policy (CSP) headers to detect and block inline script execution attempts
• Use WordPress security plugins to scan for stored XSS payloads in database content

Monitoring Recommendations

• Enable detailed access logging on WordPress installations and monitor for anomalous request patterns
• Configure Web Application Firewall (WAF) rules to alert on potential CSRF and XSS attack signatures
• Implement real-time alerting for changes to WP Lyrics plugin settings or content
• Regularly audit stored content for unauthorized modifications or script injections

How to Mitigate CVE-2025-23533

Immediate Actions Required

• Deactivate and remove the WP Lyrics plugin (wplyrics) if not essential to site functionality
• Review all stored content associated with the WP Lyrics plugin for malicious scripts or HTML
• Check WordPress user accounts for unauthorized changes or new administrator accounts
• Audit recent plugin setting changes and revert any unauthorized modifications

Patch Information

As of the last available information, WP Lyrics versions through 0.4.1 are affected. Check the WordPress plugin repository for updated versions that address this vulnerability. If no patch is available, consider using an alternative lyrics plugin that implements proper security controls.

For additional vulnerability details and patch status, refer to the Patchstack Vulnerability Advisory.

Workarounds

• Disable the WP Lyrics plugin until a security update is released
• Implement a Web Application Firewall (WAF) with rules to block CSRF and XSS attack patterns targeting the plugin
• Restrict administrative access to trusted IP addresses to reduce the attack surface
• Educate administrators about phishing risks and avoiding clicking links from untrusted sources while logged into WordPress

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate wplyrics

# Check for suspicious content in WordPress database (adjust table prefix as needed)
wp db query "SELECT * FROM wp_options WHERE option_name LIKE '%wplyrics%' AND option_value LIKE '%<script%'"