CVE-2025-25071: Vignette Ads CSRF Vulnerability

CVE-2025-25071 Overview

CVE-2025-25071 is a Cross-Site Request Forgery (CSRF) vulnerability in the topplugins Vignette Ads (vignete-ads) WordPress plugin that leads to Stored Cross-Site Scripting (XSS). The flaw affects all versions of Vignette Ads up to and including 0.2. An attacker can craft a malicious request that, when triggered by an authenticated administrator visiting an attacker-controlled page, persists arbitrary JavaScript in the plugin's stored configuration. The injected script then executes in the browser of any user rendering the affected output. The weakness is tracked as CWE-352: Cross-Site Request Forgery.

Critical Impact
A successful attack chains CSRF with Stored XSS, allowing an unauthenticated remote attacker to inject persistent scripts into a WordPress site after tricking a privileged user into visiting a malicious page.

Affected Products

topplugins Vignette Ads (vignete-ads) WordPress plugin
All versions from n/a through <= 0.2
WordPress sites with the vulnerable plugin activated

Discovery Timeline

2025-02-07 - CVE-2025-25071 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-25071

Vulnerability Analysis

The vulnerability combines two weaknesses into a single exploitation chain. The Vignette Ads plugin exposes one or more state-changing administrative endpoints that lack proper anti-CSRF protections, such as a verified WordPress nonce (wp_verify_nonce) or origin validation. Because requests are accepted based solely on the administrator's authenticated session cookie, an external attacker can forge requests on the admin's behalf.

The forged request writes attacker-controlled data into the plugin's stored settings without sanitization or output encoding. When the plugin later renders these settings in the admin dashboard or on the public site, the browser parses the injected payload as executable JavaScript. This produces Stored XSS with persistence tied to the plugin's database state.

Exploitation requires user interaction (UI:R) — the targeted administrator must visit a page controlled by the attacker while authenticated to WordPress. The scope is changed (S:C), meaning impact reaches resources beyond the vulnerable component.

Root Cause

The root cause is the absence of CSRF token validation on plugin administrative actions, compounded by missing input sanitization and output escaping for stored values. WordPress provides built-in mitigations through wp_nonce_field(), check_admin_referer(), sanitize_text_field(), and esc_html(), but the affected plugin code paths do not enforce them consistently.

Attack Vector

The attack vector is network-based and unauthenticated from the attacker's perspective. The attacker hosts a malicious HTML page containing a hidden form or JavaScript that auto-submits a POST request to the vulnerable plugin endpoint on the target WordPress site. When a logged-in administrator browses to that page, the browser includes the WordPress session cookie, and the request is processed as if the admin issued it. The XSS payload submitted through the forged request is stored and later executed in any session that loads the affected page. Refer to the Patchstack Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-25071

Indicators of Compromise

Unexpected <script> tags, event handlers (onerror=, onload=), or obfuscated JavaScript stored in Vignette Ads plugin settings within the wp_options table.
Administrator account activity initiating plugin configuration changes from referrers outside the WordPress admin domain.
Outbound requests from administrator browsers to unknown domains shortly after loading WordPress admin pages.
New or modified admin users, theme files, or scheduled tasks following a settings change to the Vignette Ads plugin.

Detection Strategies

Audit the wp_options table for plugin-related keys containing HTML or JavaScript syntax that should not appear in advertising configuration values.
Inspect web server access logs for POST requests to wp-admin/admin.php or admin-post.php referencing Vignette Ads actions that originate from external Referer headers.
Deploy a Web Application Firewall (WAF) rule set that flags requests missing valid _wpnonce parameters on plugin admin endpoints.

Monitoring Recommendations

Monitor file integrity for unexpected changes to WordPress core, theme, and plugin files following any admin session.
Alert on JavaScript executions originating from WordPress admin pages that contact non-WordPress domains.
Track plugin activation status and version inventory across all managed WordPress sites to identify exposed instances of Vignette Ads <= 0.2.

How to Mitigate CVE-2025-25071

Immediate Actions Required

Deactivate and uninstall the Vignette Ads (vignete-ads) plugin until a patched release becomes available, since the latest version (0.2) remains vulnerable.
Force a password reset for all WordPress administrator accounts and invalidate active sessions to revoke any cookies that may have been abused.
Review the wp_options table and plugin-specific database entries, removing any HTML or JavaScript payloads found in stored settings.
Audit administrator accounts, scheduled tasks (wp_cron), and theme files for unauthorized modifications.

Patch Information

At the time of publication, no fixed version of the Vignette Ads plugin is listed. The vulnerability affects all releases through <= 0.2. Monitor the Patchstack Vulnerability Report and the WordPress.org plugin repository for an updated release.

Workarounds

Remove the plugin entirely if business requirements do not strictly depend on it; this eliminates the attack surface.
Restrict access to /wp-admin/ using IP allowlists or VPN-only access to reduce the chance of administrators browsing untrusted content while authenticated.
Deploy a WAF rule that requires a valid Referer and Origin matching the site host on all wp-admin POST requests.
Enforce Content Security Policy (CSP) headers that disallow inline scripts to reduce the impact of stored XSS payloads.

bash

# Example: deactivate the vulnerable plugin via WP-CLI
wp plugin deactivate vignete-ads
wp plugin delete vignete-ads

# Example: search the database for suspicious script content in plugin options
wp db query "SELECT option_name, option_value FROM wp_options WHERE option_name LIKE '%vignete%' AND option_value LIKE '%<script%';"