CVE-2025-23901 Overview
CVE-2025-23901 is a Cross-Site Request Forgery (CSRF) vulnerability in the cybio GravatarLocalCache WordPress plugin. The flaw affects all versions up to and including 1.1.2. According to the Patchstack Vulnerability Report, the CSRF flaw can be chained to achieve stored Cross-Site Scripting (XSS) on affected WordPress sites.
The vulnerability is tracked under CWE-352: Cross-Site Request Forgery. Exploitation requires an authenticated administrator to interact with attacker-supplied content, such as visiting a malicious link.
Critical Impact
An attacker can trick an authenticated administrator into submitting a forged request that injects persistent JavaScript into plugin settings, leading to stored XSS execution in the WordPress admin context.
Affected Products
- cybio GravatarLocalCache plugin for WordPress
- All versions from n/a through 1.1.2
- WordPress sites with the plugin installed and active
Discovery Timeline
- 2025-01-16 - CVE-2025-23901 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-23901
Vulnerability Analysis
The GravatarLocalCache plugin exposes administrative actions without validating the origin or authenticity of incoming requests. The plugin fails to verify WordPress nonces or other anti-CSRF tokens on state-changing endpoints. An attacker who lures an authenticated administrator to a malicious page can force the browser to issue authorized requests against the WordPress site.
Because the plugin also lacks proper output encoding on stored configuration values, the CSRF primitive escalates into a stored XSS condition. Injected JavaScript executes in the administrator's browser session whenever the affected admin page is rendered, enabling session theft, privilege abuse, and persistent backdoor injection.
Root Cause
The root cause is the absence of CSRF protection on plugin request handlers, combined with insufficient input sanitization and output escaping on stored settings. WordPress provides wp_nonce_field() and check_admin_referer() APIs to mitigate CSRF, but the affected handlers omit these checks. Stored values are then rendered into the admin UI without applying esc_html() or esc_attr().
Attack Vector
Exploitation is network-based and requires user interaction. The attacker hosts a malicious page that auto-submits a crafted form to the vulnerable WordPress endpoint. When a logged-in administrator visits the page, the browser submits the request with valid session cookies, persisting the attacker's payload. Subsequent admin views of the plugin settings trigger execution of the injected script.
No authentication is needed by the attacker. The privileges required come from the victim administrator's authenticated session, and the impact crosses a security boundary into the WordPress admin scope.
The vulnerability mechanism is described in prose only as no verified proof-of-concept code is publicly available. See the Patchstack advisory for additional technical details.
Detection Methods for CVE-2025-23901
Indicators of Compromise
- Unexpected <script> tags or HTML event handlers stored in GravatarLocalCache plugin options within the wp_options table.
- Unauthorized administrator account creation or modification following admin sessions on suspicious external sites.
- Outbound requests from administrator browsers to attacker-controlled domains shortly after WordPress admin logins.
Detection Strategies
- Inspect WordPress database wp_options rows associated with the GravatarLocalCache plugin for HTML or JavaScript content that should not be present in configuration values.
- Review web server access logs for POST requests to plugin endpoints lacking a same-origin Referer header or missing nonce parameters.
- Audit installed plugin versions across managed WordPress sites and flag any GravatarLocalCache instance at version 1.1.2 or earlier.
Monitoring Recommendations
- Enable WordPress audit logging to capture plugin setting changes with user, timestamp, and source IP attribution.
- 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 patterns originating from wp-admin pages.
How to Mitigate CVE-2025-23901
Immediate Actions Required
- Deactivate and remove the GravatalLocalCache plugin if a patched version is not available, since the vendor has not published a fix at the time of NVD publication.
- Force-rotate administrator credentials and active session tokens on any WordPress site that ran version 1.1.2 or earlier.
- Audit wp_options and user metadata for injected scripts and remove malicious payloads before re-enabling the plugin.
Patch Information
No vendor patch is referenced in the CVE record or the Patchstack Vulnerability Report. Administrators should monitor the plugin's repository page on WordPress.org for an updated release beyond 1.1.2 and apply it immediately when available.
Workarounds
- Restrict /wp-admin/ access to trusted IP ranges using web server or WAF rules to limit CSRF exposure.
- Require administrators to use a dedicated browser profile or container for WordPress administration to prevent cross-site cookie reuse.
- Enforce strict SameSite=Lax or SameSite=Strict cookie attributes on WordPress authentication cookies via configuration.
- Deploy a WAF rule that blocks state-changing POST requests to plugin endpoints when the Referer header is missing or external.
# Example: Disable the vulnerable plugin via WP-CLI until a patch is released
wp plugin deactivate gravatarlocalcache
wp plugin delete gravatarlocalcache
# Example: Audit options table for injected script content
wp db query "SELECT option_name, option_value FROM wp_options \
WHERE option_name LIKE '%gravatarlocalcache%' \
AND option_value LIKE '%<script%';"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
