CVE-2025-3868 Overview
CVE-2025-3868 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Custom Admin-Bar Favorites plugin for WordPress. The flaw affects all versions up to and including 0.1. The vulnerability exists in the menuObject parameter, which lacks proper input sanitization and output escaping [CWE-79].
Unauthenticated attackers can inject arbitrary web scripts into pages rendered by the plugin. Exploitation requires user interaction, such as clicking a crafted link. When triggered, the injected script executes in the victim's browser session within the WordPress site context.
Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in an authenticated user's browser, potentially leading to session hijacking, credential theft, or unauthorized administrative actions.
Affected Products
- Custom Admin-Bar Favorites plugin for WordPress
- All versions up to and including 0.1
- WordPress sites with the plugin installed and active
Discovery Timeline
- 2025-04-25 - CVE-2025-3868 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-3868
Vulnerability Analysis
The vulnerability is a Reflected Cross-Site Scripting (XSS) flaw classified under [CWE-79]. The Custom Admin-Bar Favorites plugin accepts data through the menuObject parameter without sufficient validation. User-controlled input is reflected back into the HTTP response without encoding dangerous characters such as <, >, and quotation marks.
Because the parameter value reaches the rendered page unfiltered, an attacker can supply JavaScript payloads that the browser executes as part of the page. The Wordfence advisory tracks this issue under vulnerability identifier 417fb507-a414-4bc2-ab01-d6f2fc554350. Refer to the Wordfence Vulnerability Report for additional context.
Root Cause
The root cause is insufficient input sanitization and missing output escaping on the menuObject request parameter. The plugin does not apply WordPress escaping functions such as esc_html(), esc_attr(), or wp_kses() before echoing the value into HTML context. This allows raw script tags and event handlers to persist in the response.
Attack Vector
The attack requires no authentication but does require user interaction. An attacker crafts a URL containing a malicious payload in the menuObject parameter and delivers it via phishing email, social media, or a compromised site. When a logged-in WordPress user follows the link, the payload executes in their browser under the site's origin.
The attacker can then perform actions on behalf of the victim, exfiltrate cookies or session tokens, or pivot to administrative functionality if the victim holds elevated privileges. See the Admin Bookmarks Plugin Information page for related plugin details.
Detection Methods for CVE-2025-3868
Indicators of Compromise
- HTTP requests containing menuObject parameter values with <script>, javascript:, or HTML event handler substrings such as onerror= or onload=.
- Referrer headers pointing to external domains preceding requests that include the menuObject parameter.
- Web server access logs showing URL-encoded payloads such as %3Cscript%3E targeting plugin endpoints.
Detection Strategies
- Inspect WordPress access logs for GET or POST requests carrying the menuObject parameter with markup characters.
- Deploy a Web Application Firewall (WAF) rule that blocks reflected XSS patterns targeting the plugin's request handlers.
- Correlate suspicious outbound requests from administrator browsers immediately after clicks on external links.
Monitoring Recommendations
- Enable verbose logging on the WordPress instance and forward logs to a centralized analytics platform for query and alerting.
- Alert on any anomalous session activity from administrator accounts following external referrer traffic.
- Track plugin file integrity to detect follow-on modifications from a successful XSS-driven administrative action.
How to Mitigate CVE-2025-3868
Immediate Actions Required
- Deactivate and remove the Custom Admin-Bar Favorites plugin until a patched version is available.
- Restrict administrator access by requiring multi-factor authentication and limiting privileged sessions.
- Audit user accounts and sessions for unauthorized activity that may indicate prior exploitation.
Patch Information
No vendor-supplied patch is referenced in the NVD entry for CVE-2025-3868 at the time of publication. Site administrators should monitor the WordPress plugin repository and the Wordfence Vulnerability Report for updates. Until a fix ships, removal of the plugin is the most reliable remediation.
Workarounds
- Uninstall the plugin from all WordPress instances where it is not strictly required.
- Configure a WAF to strip or block requests containing script tags or JavaScript URIs in the menuObject parameter.
- Enforce a strict Content Security Policy (CSP) that disallows inline scripts to reduce the impact of reflected XSS.
# Configuration example: remove the plugin via WP-CLI
wp plugin deactivate admin-bookmarks
wp plugin uninstall admin-bookmarks
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
