Vulnerability Description
The Firebase Support & Chat Management plugin for WordPress is vulnerable to privilege escalation in all versions up to, and including, 3.1.1. This is due to the `firebase_auth()` function authenticating the request as the WordPress user whose email is supplied in the `user_email` POST parameter without verifying ownership of that email (no Firebase ID token signature/issuer/audience verification). This makes it possible for authenticated attackers, with Subscriber-level access and above, to log in as an arbitrary existing user — including an Administrator — by submitting that user's email address to the `acb_firebase_auth` AJAX action, resulting in full account takeover.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/admin-chat-box/tags/3.1.1/inc/ACB_Aja
- https://plugins.trac.wordpress.org/browser/admin-chat-box/tags/3.1.1/inc/ACB_Aja
- https://plugins.trac.wordpress.org/browser/admin-chat-box/trunk/inc/ACB_AjaxHand
- https://plugins.trac.wordpress.org/browser/admin-chat-box/trunk/inc/ACB_AjaxHand
- https://www.wordfence.com/threat-intel/vulnerabilities/id/90783d75-a255-4133-ac7
FAQ
What is CVE-2026-8787?
CVE-2026-8787 is a vulnerability with a CVSS score of 8.8 (HIGH). The Firebase Support & Chat Management plugin for WordPress is vulnerable to privilege escalation in all versions up to, and including, 3.1.1. This is due to the `firebase_auth()` function authenticat...
How severe is CVE-2026-8787?
CVE-2026-8787 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-8787?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.