CVE-2026-48611 Auth bypass in phpBB
Attackers can hijack accounts in default phpBB installations due to improper OAuth authentication checks, leading to unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48611?
CVE-2026-48611 is a critical authentication bypass vulnerability in phpBB, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to unauthorized access in default installations.
Weakness: CWE-287
Which versions are affected by CVE-2026-48611?
How do I fix CVE-2026-48611?
No fix has been published for CVE-2026-48611 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-2026-48611 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48611 exists.
Public exploit code: 1 Nuclei template and 2 proofs of concept on GitHub.
Sources
Also known as GHSA-24pr-8ggp-h88c.