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.
References5
- plugins.trac.wordpress.org/browser/admin-chat-box/tags/3.1.1/in…
- plugins.trac.wordpress.org/browser/admin-chat-box/tags/3.1.1/in…
- plugins.trac.wordpress.org/browser/admin-chat-box/trunk/inc/ACB…
- plugins.trac.wordpress.org/browser/admin-chat-box/trunk/inc/ACB…
- www.wordfence.com/threat-intel/vulnerabilities/id/90783d75-a255…
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 21 · as of 14 November 2026
- CWE
- CWE-269
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.