CVE-2025-25075: WordPress Show Notice Plugin CSRF Flaw

CVE-2025-25075 Overview

CVE-2025-25075 is a Cross-Site Request Forgery (CSRF) vulnerability in the WordPress plugin "Show notice or message on admin area" by Venugopal. The flaw chains into a Stored Cross-Site Scripting (XSS) condition, allowing attackers to persist malicious JavaScript in administrative interfaces. The vulnerability affects all plugin versions from n/a through 2.0. Exploitation requires user interaction, typically tricking an authenticated administrator into visiting a crafted page. Successful exploitation results in script execution within the WordPress admin context, enabling session theft, account takeover, and further site compromise [CWE-352].

Critical Impact

An attacker who lures an authenticated WordPress administrator to a malicious page can inject persistent JavaScript into the admin area, leading to account compromise and site-wide tampering.

Affected Products

• WordPress plugin: Show notice or message on admin area (show-notice-or-message-on-admin-area)
• Versions: through 2.0 (inclusive)
• Vendor: Venugopal

Discovery Timeline

• 2025-02-07 - CVE CVE-2025-25075 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-25075

Vulnerability Analysis

The vulnerability exists because the plugin's administrative form-handling endpoints do not validate WordPress nonce tokens or verify request origin before processing state-changing requests. An attacker hosts a malicious page containing a forged form or script targeting the plugin's admin endpoint. When an authenticated administrator visits the page, the browser submits the request with valid session cookies attached.

The submitted payload is stored in the plugin's notice or message configuration without sufficient output encoding or input sanitization. When any administrator subsequently loads the affected admin page, the stored payload renders in the Document Object Model (DOM) and executes JavaScript in the privileged admin session. This combination converts a single CSRF action into persistent script execution that affects every admin user viewing the area.

Root Cause

The root cause is the absence of CSRF protection ([CWE-352]) on plugin endpoints that update notice or message content. WordPress provides wp_nonce_field() and check_admin_referer() primitives for this purpose, and the affected versions do not enforce them. The downstream Stored XSS results from the same handler failing to sanitize input with functions such as wp_kses_post() or escape output with esc_html() / esc_attr().

Attack Vector

Exploitation occurs over the network and requires user interaction. The attacker crafts a page that auto-submits a form to the vulnerable WordPress instance. The targeted administrator must be authenticated to the WordPress site and must visit the attacker-controlled page. No credentials or privileges are required from the attacker. Once the payload is stored, every visit to the affected admin area triggers the injected script. See the Patchstack Vulnerability Analysis for additional technical context.

Detection Methods for CVE-2025-25075

Indicators of Compromise

• Unexpected <script>, onerror=, or onload= content rendered inside WordPress admin notices or dashboard messages.
• Outbound HTTP requests from administrator browsers to unfamiliar domains immediately after loading wp-admin pages.
• Modifications to plugin option rows in the wp_options table without a corresponding administrator audit-log entry.

Detection Strategies

• Inspect plugin-managed options and post metadata for HTML or JavaScript payloads that should not appear in plain notice text.
• Review web server access logs for POST requests to plugin admin endpoints lacking a same-origin Referer header.
• Compare the installed plugin version against 2.0 and flag any instance at or below this version as vulnerable.

Monitoring Recommendations

• Enable WordPress audit logging to capture option changes, plugin setting updates, and administrator session activity.
• Deploy a Web Application Firewall (WAF) rule set that flags cross-origin POST requests to wp-admin endpoints.
• Monitor administrator browser sessions for anomalous JavaScript execution and Content Security Policy (CSP) violation reports.

How to Mitigate CVE-2025-25075

Immediate Actions Required

• Deactivate and remove the "Show notice or message on admin area" plugin until a fixed version is published.
• Audit all plugin-stored notices and messages, removing any entries containing HTML or script content.
• Force a password reset and session invalidation for all WordPress administrators if compromise is suspected.

Patch Information

At the time of the latest NVD update, no vendor-supplied patched version is identified for versions through 2.0. Administrators should consult the Patchstack advisory for updated remediation guidance and replace the plugin with a maintained alternative if no patch becomes available.

Workarounds

• Restrict access to /wp-admin/ by source IP using server-level controls to reduce CSRF exposure.
• Apply a strict Content Security Policy that disallows inline scripts in administrative pages.
• Require administrators to use a separate browser profile or session for WordPress administration to limit cross-site request reuse.

# Example: restrict wp-admin to trusted IPs in nginx
location ^~ /wp-admin/ {
    allow 203.0.113.0/24;
    deny all;
    try_files $uri $uri/ /index.php?$args;
}