CVE-2026-48611 Details.
phpBB < 3.3.17 - Authentication Bypass
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-48611. What It Means.
phpBB before 3.3.17 contains an authentication bypass vulnerability in the login-link feature. By setting the auth_provider query parameter to "apache", an unauthenticated attacker can bypass password verification and log in as any user, including administrators. The Apache auth provider trusts the Basic authentication header username without password verification, as it assumes Apache handles authentication upstream.
Affected Product. What Is Hit.
- Vendor
- phpbb
- Product
- phpBB
References. Where To Read More.
FAQ
Common Questions.
phpBB < 3.3.17 - Authentication Bypass. phpBB before 3.3.17 contains an authentication bypass vulnerability in the login-link feature. By setting the auth_provider query parameter to "apache", an unauthenticated attacker can bypass password verification and log in as any user, including administrators. The Apache auth provider trusts the Basic authentication header username without password verification, as it assumes Apache handles authentication upstream.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-48611 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-48611 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update phpBB to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-48611. Atlas does not run a check for it, so nothing here says whether a particular site is affected.