CVE-2025-9625 Overview
CVE-2025-9625 is a Cross-Site Request Forgery (CSRF) vulnerability in the Coil Web Monetization plugin for WordPress. The flaw affects all versions up to and including 2.0.2. The vulnerability stems from missing or incorrect nonce validation on the coil-get-css-selector parameter handled by the maybe_restrict_content function. Unauthenticated attackers can trigger the CSS selector detection functionality by tricking an authenticated site administrator into clicking a crafted link. The issue is classified under CWE-352: Cross-Site Request Forgery.
Critical Impact
An unauthenticated attacker can invoke privileged plugin functionality on behalf of a site administrator through a forged HTTP request, provided the administrator interacts with an attacker-controlled link.
Affected Products
- Coil Web Monetization plugin for WordPress, versions up to and including 2.0.2
- WordPress sites where the plugin is installed and active
- Administrator accounts able to reach the vulnerable request handler
Discovery Timeline
- 2025-11-18 - CVE-2025-9625 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-9625
Vulnerability Analysis
The Coil Web Monetization plugin exposes functionality tied to the coil-get-css-selector parameter through the maybe_restrict_content function. This handler processes requests without verifying a valid WordPress nonce token. Because state-changing or sensitive actions occur without anti-CSRF protection, any origin can compose a request that WordPress executes using the victim administrator's authenticated session cookies. The vulnerability requires user interaction, such as an administrator clicking a malicious link while logged in. Impact is limited to integrity, with no direct effect on confidentiality or availability of the underlying site data.
Root Cause
The root cause is missing or incorrect nonce validation in the maybe_restrict_content function. WordPress provides the wp_verify_nonce and check_admin_referer primitives to defend against CSRF, but the vulnerable code path does not enforce either before acting on the coil-get-css-selector input. Relevant source lines are visible in the plugin trac at functions.php#L48 and gating/functions.php#L195.
Attack Vector
An attacker crafts a page or link that issues a request to the target WordPress site containing the coil-get-css-selector parameter. The attacker delivers the link through phishing, forum posts, or comments. When a logged-in administrator opens the link, the browser attaches the session cookies and the vulnerable handler executes the CSS selector detection functionality. The attack does not require authentication or elevated privileges on the attacker side.
No public proof-of-concept exploit or exploitation in the wild has been documented. See the Wordfence Vulnerability Analysis for further technical breakdown.
Detection Methods for CVE-2025-9625
Indicators of Compromise
- Web server access logs containing unexpected requests with the coil-get-css-selector query parameter originating from external Referer headers.
- Administrator sessions issuing requests to the Coil plugin endpoints immediately after clicking third-party links.
- Presence of Coil Web Monetization plugin at version 2.0.2 or earlier on the WordPress installation.
Detection Strategies
- Inventory WordPress installations and flag any deployment of the Coil Web Monetization plugin at versions <= 2.0.2.
- Inspect HTTP request logs for the coil-get-css-selector parameter combined with cross-origin Referer or Origin headers.
- Correlate administrator authentication events with subsequent state-changing plugin requests that lack a WordPress nonce.
Monitoring Recommendations
- Forward WordPress and web server logs to a centralized analytics platform and alert on anomalous parameter usage against plugin endpoints.
- Monitor plugin update feeds and Wordfence advisories for Coil Web Monetization to track patch availability.
- Alert on administrator accounts performing plugin configuration actions from unusual referrers or IP addresses.
How to Mitigate CVE-2025-9625
Immediate Actions Required
- Identify all WordPress sites running the Coil Web Monetization plugin and confirm the installed version.
- Deactivate the Coil Web Monetization plugin on affected sites until a patched release is installed.
- Instruct administrators to log out of WordPress sessions before browsing untrusted links and to use separate browser profiles for administration.
Patch Information
At the time of publication, no vendor-supplied patched version is referenced in the NVD entry. Track the plugin listing on the WordPress plugin repository and the Wordfence advisory for release of a version that adds nonce validation to the maybe_restrict_content handler.
Workarounds
- Restrict access to the WordPress administration interface using IP allowlists at the web server or WAF layer.
- Deploy a WordPress security plugin or WAF rule that blocks requests carrying the coil-get-css-selector parameter without a valid _wpnonce value.
- Enforce short administrator session lifetimes and require re-authentication for sensitive plugin actions.
- Require administrators to use browsers with strict SameSite cookie enforcement to reduce CSRF exposure.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
