CVE-2025-23884: Annie Plugin CSRF Vulnerability

CVE-2025-23884 Overview

CVE-2025-23884 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the WordPress Annie plugin developed by Chris Roberts. This vulnerability allows attackers to trick authenticated users into performing unintended actions by crafting malicious requests that the vulnerable application cannot distinguish from legitimate user actions.

The vulnerability can be chained with Stored Cross-Site Scripting (XSS), significantly amplifying its impact. When exploited, an attacker could leverage a victim's authenticated session to inject persistent malicious scripts or modify plugin settings without authorization.

Critical Impact

This CSRF vulnerability can be chained with Stored XSS, allowing attackers to execute arbitrary JavaScript in the context of authenticated users' sessions, potentially leading to account compromise and data theft.

Affected Products

• Annie WordPress Plugin version 2.1.1 and earlier
• All WordPress installations running affected versions of the Annie plugin

Discovery Timeline

• 2025-01-16 - CVE-2025-23884 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23884

Vulnerability Analysis

This Cross-Site Request Forgery vulnerability exists due to missing or improper validation of CSRF tokens in the Annie WordPress plugin. The plugin fails to implement adequate anti-CSRF protections on sensitive operations, allowing attackers to craft malicious web pages that submit forged requests on behalf of authenticated users.

The vulnerability is particularly concerning because it can be chained with Stored XSS, meaning an attacker can first use CSRF to inject malicious JavaScript that persists in the database, which then executes whenever users view the affected content. This attack requires user interaction—specifically, an authenticated user must visit a malicious page while logged into the WordPress site—but no other privileges are needed to initiate the attack.

The impact includes the ability to modify plugin settings, inject persistent scripts, and potentially compromise the integrity of the WordPress installation. The scope is considered changed because the vulnerability can affect resources beyond the vulnerable component through the XSS chain.

Root Cause

The root cause of this vulnerability is the absence of proper CSRF token validation (nonce verification) in the Annie plugin's form handling and AJAX request processing. WordPress provides built-in nonce functionality through wp_create_nonce() and wp_verify_nonce() functions, but the vulnerable versions of Annie fail to properly implement these security measures on state-changing operations.

This omission is classified under CWE-352 (Cross-Site Request Forgery), which describes scenarios where web applications do not sufficiently verify that requests were intentionally sent by the user who submitted them.

Attack Vector

The attack is network-based and requires the victim to be authenticated to the WordPress site. An attacker crafts a malicious webpage containing hidden forms or JavaScript that automatically submits requests to the vulnerable Annie plugin endpoints. When an authenticated administrator or user with appropriate permissions visits the attacker's page, the browser automatically includes the user's session cookies with the forged request, causing the WordPress site to process it as legitimate.

The attack flow typically involves:

1. Attacker identifies vulnerable endpoints in the Annie plugin that lack CSRF protection
2. Attacker creates a malicious page with auto-submitting forms targeting these endpoints
3. Attacker tricks an authenticated user into visiting the malicious page (via phishing, malicious ads, or compromised websites)
4. The victim's browser sends the forged request with valid session credentials
5. The WordPress site processes the request, potentially storing malicious XSS payloads

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Plugin Advisory.

Detection Methods for CVE-2025-23884

Indicators of Compromise

• Unexpected changes to Annie plugin settings without administrator action
• Presence of suspicious JavaScript code in plugin-managed content or database entries
• Web server logs showing POST requests to Annie plugin endpoints from external referrers
• User reports of unusual behavior when viewing pages managed by the Annie plugin

Detection Strategies

• Review web server access logs for POST requests to Annie plugin endpoints with suspicious or external Referer headers
• Implement Content Security Policy (CSP) headers to detect and block unauthorized script execution
• Monitor WordPress database tables associated with the Annie plugin for unexpected modifications
• Deploy Web Application Firewall (WAF) rules to detect CSRF attack patterns targeting WordPress plugins

Monitoring Recommendations

• Enable detailed logging for all WordPress plugin administrative actions
• Configure alerts for changes to plugin settings outside of normal administrative hours
• Implement file integrity monitoring on WordPress plugin directories
• Monitor for the creation of new administrator accounts or privilege escalations

How to Mitigate CVE-2025-23884

Immediate Actions Required

• Disable or deactivate the Annie plugin until a patched version is available
• Audit Annie plugin settings and database entries for any unauthorized changes or injected content
• Review web server logs for evidence of exploitation attempts
• Implement additional CSRF protections at the WAF level if the plugin cannot be disabled

Patch Information

As of the last available information, the vulnerability affects Annie plugin versions through 2.1.1. Site administrators should check the WordPress plugin repository and the Patchstack advisory for updates on patched versions. If no patch is available, consider removing the plugin and seeking alternative solutions.

Workarounds

• Temporarily deactivate the Annie plugin until a security update is released
• Restrict access to the WordPress admin panel to trusted IP addresses only
• Implement strict Content Security Policy headers to mitigate potential XSS impact
• Use a Web Application Firewall with CSRF protection rules enabled
• Educate administrators to avoid clicking links or visiting untrusted websites while logged into WordPress

# Example: Restrict WordPress admin access by IP in .htaccess
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from YOUR.TRUSTED.IP.ADDRESS
</Files>