CVE-2025-23821 Overview
CVE-2025-23821 is a Cross-Site Request Forgery (CSRF) vulnerability in the WP Cookies Alert WordPress plugin developed by aleapp. The flaw affects all versions of the plugin from initial release through 1.1.1. According to the Patchstack advisory, the CSRF condition can be chained into a stored Cross-Site Scripting (XSS) attack, allowing an attacker to persist malicious JavaScript within the WordPress site once an authenticated administrator is tricked into triggering a forged request.
The weakness is tracked under CWE-352: Cross-Site Request Forgery.
Critical Impact
An unauthenticated attacker can coerce an authenticated administrator into executing unintended state-changing requests, leading to stored XSS payloads being injected into the affected WordPress site.
Affected Products
- WP Cookies Alert WordPress plugin versions through 1.1.1
- WordPress installations with the wp-cookies-alert plugin enabled
- Sites where administrators browse external content while authenticated to wp-admin
Discovery Timeline
- 2025-01-16 - CVE-2025-23821 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-23821
Vulnerability Analysis
The vulnerability stems from missing or improperly validated anti-CSRF tokens on state-changing endpoints exposed by the WP Cookies Alert plugin. When an authenticated WordPress administrator visits an attacker-controlled page, the browser automatically attaches the administrator's session cookies to a forged request directed at the vulnerable plugin endpoint. The plugin processes the request without verifying its origin or validating a nonce.
Because the plugin also fails to sanitize the resulting input, the forged request writes attacker-controlled content into stored plugin settings. That stored content is rendered to other users without proper encoding, producing a stored XSS condition. The Patchstack advisory classifies this as a CSRF-to-stored-XSS chain.
Root Cause
The root cause is the absence of a valid WordPress nonce check, typically performed with check_admin_referer() or wp_verify_nonce(), on the plugin's settings update handler. Combined with insufficient output escaping via functions such as esc_html() or esc_attr(), the input introduced through the forged request is later reflected in administrative pages as executable script.
Attack Vector
Exploitation requires user interaction from an authenticated administrator. The attacker hosts a malicious page that issues a forged POST or GET request to the vulnerable plugin endpoint. The administrator's browser sends the request with valid session credentials, and the plugin accepts the change. On subsequent visits to the cookie alert configuration screen, the injected JavaScript executes in the administrator's browser context, enabling session theft, privilege abuse, or persistent backdoor installation.
No verified public exploit code is available for CVE-2025-23821. Refer to the Patchstack Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-23821
Indicators of Compromise
- Unexpected <script>, onerror, or onload attributes inside WP Cookies Alert plugin settings stored in the wp_options table
- Administrator sessions performing settings updates immediately after visiting external untrusted URLs
- Outbound requests from administrator browsers to unfamiliar domains after loading wp-admin pages that render the cookie banner
Detection Strategies
- Audit the wp_options table for plugin option keys associated with wp-cookies-alert containing HTML or JavaScript markup
- Inspect web server access logs for cross-origin Referer headers preceding POST requests to plugin admin endpoints
- Review WordPress activity logs for plugin configuration changes that lack a corresponding authenticated admin navigation flow
Monitoring Recommendations
- Enable a web application firewall (WAF) rule set that enforces Origin and Referer validation on /wp-admin/ POST traffic
- Monitor administrator endpoints for outbound connections to unrecognized hosts that may indicate XSS callback execution
- Alert on modifications to WordPress plugin options outside of approved change windows
How to Mitigate CVE-2025-23821
Immediate Actions Required
- Deactivate the WP Cookies Alert plugin on any site running version 1.1.1 or earlier until a patched release is verified
- Rotate administrator credentials and invalidate active WordPress sessions if exploitation is suspected
- Inspect and clean plugin-related entries in wp_options to remove any injected script payloads
Patch Information
At the time of NVD publication, no fixed version had been confirmed by the vendor. Administrators should monitor the Patchstack Vulnerability Report and the official WordPress plugin repository for a release that supersedes version 1.1.1 and introduces nonce validation along with output escaping.
Workarounds
- Remove the wp-cookies-alert plugin and replace it with an actively maintained consent management plugin that enforces CSRF protection
- Restrict administrator access to wp-admin through IP allowlisting or VPN to reduce CSRF exposure
- Deploy a virtual patch via a WAF that blocks requests to plugin endpoints lacking valid WordPress nonces
- Enforce a strict Content Security Policy (CSP) on wp-admin pages to limit execution of inline scripts injected through stored XSS
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
