🏴☠️ New #offensivesecurity research: phpBB authentication bypass discovered by Pentest-Tools.com! And it packs *two* vulnerabilities. 👇👇👇
⚡PTT-2026-004 (CVSS 9.4 - critical): one HTTP request, a target username, a wrong password phpBB never checks. You get back a valid session cookie for that account.
Admins included.
Works on every default phpBB install up to and including 3.3.16, no prior access needed.
The vulnerable code path got introduced more than 10 years ago and survived multiple major releases and security reviews before Alex Dan, offsec researcher at Pentest-Tools.com, found it along with...
⚡PTT-2026-005 (CVSS 8.3 - high) which chains two OAuth defects for a silent account takeover on sites with OAuth configured. In some cases, the victim doesn't need to click anything - an image tag embedded in a forum post is enough to trigger it.
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Full technical breakdown & mitigation steps 👉 https://pentest-tools.com/research/phpbb-authentication-bypass "