CVE-2025-49446: Admin Notes Plugin CSRF Vulnerability

CVE-2025-49446 Overview

CVE-2025-49446 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the admin-note (Admin Notes) plugin by minhlaobao for WordPress. The issue impacts all plugin versions up to and including 1.1. An attacker can craft a malicious web page that, when visited by an authenticated administrator, triggers unintended state-changing actions in the plugin. The weakness is classified under CWE-352: Cross-Site Request Forgery. Exploitation requires user interaction but no authentication on the attacker's side, since the victim's browser supplies the authenticated session.

Critical Impact
A successful attack can modify administrative notes on a WordPress site without the site administrator's knowledge or consent, resulting in limited integrity impact.

Affected Products

WordPress plugin admin-note (Admin Notes) by minhlaobao
All versions from initial release through 1.1
WordPress sites with the plugin installed and active

Discovery Timeline

2025-06-06 - CVE-2025-49446 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-49446

Vulnerability Analysis

The Admin Notes plugin fails to validate the origin of state-changing HTTP requests. Sensitive administrative actions in the plugin do not verify a WordPress nonce or equivalent anti-CSRF token before processing. Any authenticated administrator visiting an attacker-controlled page can be forced to submit requests to the vulnerable endpoint. The browser automatically attaches the administrator's session cookies, causing the server to accept the forged request as legitimate.

This class of flaw is documented in [CWE-352]. The PatchStack advisory confirms the issue affects the plugin up to version 1.1. See the PatchStack WordPress CSRF Vulnerability advisory for the vendor-tracked entry.

Root Cause

The root cause is missing CSRF protection on plugin request handlers. WordPress provides the wp_nonce_field() and check_admin_referer() primitives specifically to defeat CSRF, but the plugin's action handlers do not call these functions before mutating stored data. Requests are authorized based only on the presence of a valid session cookie.

Attack Vector

The attack requires an authenticated WordPress administrator to visit a malicious page or click a crafted link while logged in. The attacker hosts an HTML form or auto-submitting script that targets the plugin's action URL on the victim site. When the administrator's browser submits the request, WordPress processes it under the administrator's identity. No credentials leave the victim's browser, and the attacker never observes the response.

Exploitation typically occurs through phishing emails, malicious advertisements, or attacker-controlled forum posts that entice an administrator to load a page containing the forged request. The confidentiality of stored data is unaffected, but the integrity of admin notes can be modified without consent.

Detection Methods for CVE-2025-49446

Indicators of Compromise

Unexpected modifications to admin note content or metadata in the WordPress database, particularly on the wp_options or plugin-specific tables used by admin-note.
POST requests to plugin endpoints originating from external Referer headers rather than the site's own wp-admin interface.
Administrator sessions performing plugin actions immediately after visiting external URLs in web proxy or browser history logs.

Detection Strategies

Review WordPress access logs for POST requests to plugin action URLs where the Referer header points to an unrelated third-party domain.
Correlate administrator login activity with plugin data changes to identify actions performed without a corresponding wp-admin navigation trail.
Deploy a Web Application Firewall (WAF) rule to alert on state-changing requests to the plugin that lack a valid WordPress nonce parameter.

Monitoring Recommendations

Enable WordPress audit logging to record who changed plugin-managed content and from what source IP.
Monitor for anomalous Referer values on authenticated wp-admin POST requests in reverse proxy or CDN logs.
Alert on any plugin write operations occurring outside expected administrator working hours.

How to Mitigate CVE-2025-49446

Immediate Actions Required

Deactivate the admin-note plugin until a patched version is released by the vendor.
Restrict WordPress administrator accounts from browsing untrusted sites while logged in.
Require administrators to use separate browser profiles or sessions for WordPress management tasks.

Patch Information

At the time of the NVD entry, no fixed version is listed. The advisory states the vulnerability affects versions through 1.1. Monitor the PatchStack advisory and the WordPress plugin repository for an updated release that adds nonce verification to all state-changing handlers.

Workarounds

Remove or disable the plugin if administrative note functionality is not business-critical.
Deploy a WAF rule that blocks POST requests to plugin endpoints when the Referer header does not match the site's own domain.
Enforce SameSite=Lax or SameSite=Strict cookie attributes on WordPress session cookies to reduce cross-origin cookie exposure.

bash

# Example WAF rule (ModSecurity) blocking cross-origin POSTs to the plugin
SecRule REQUEST_METHOD "@streq POST" \
  "chain,id:1004946,phase:1,deny,status:403,\
  msg:'Blocked cross-origin request to admin-note plugin (CVE-2025-49446)'"
    SecRule REQUEST_URI "@contains /wp-admin/admin.php?page=admin-note" \
      "chain"
    SecRule REQUEST_HEADERS:Referer "!@beginsWith https://your-site.example/" "t:none"