CVE-2026-8787 Firebase Support & Chat Management <= 3.1.1 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation
Authenticated subscribers can escalate privileges to administrator by spoofing email addresses in the Firebase authentication function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8787?
CVE-2026-8787 is a high-severity authentication bypass vulnerability in devsabbirahmed Firebase Support & Chat Management, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2026-8787?
How do I fix CVE-2026-8787?
No fix has been published for CVE-2026-8787 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-8787 being exploited?
There is no known exploitation of CVE-2026-8787 in the wild and no public exploit code.
Sources
Also known as GHSA-g86w-5353-83r2.