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PhpBB authentication bypass flaw

Vulnerability
First reported
Last updated
Happening score
H score 33
2 unique sources, 2 articles

Summary

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A critical phpBB authentication bypass now exposes versions up to 3.3.16 and the 4.0.0 alpha to account takeover, including administrators, through one unauthenticated request. The flaw affects standard installs in default database-authentication mode, so a normal deployment can be vulnerable out of the box. phpBB 3.3.17 is the complete fix and affected operators need to upgrade.

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Modular DS WordPress plugin unauthenticated privilege escalation (CVE-2026-23550)

Vulnerability
H score14 First: 15.01.2026 17:31 Last: 15.01.2026 17:31 Sources 1

About this happening: Active exploitation of CVE-2026-23550 in the Modular DS WordPress plugin puts all versions through 2.5.1 at risk of unauthenticated privilege escalation. The flaw...

Latest development: 15.01.2026 22:49

Modular DS released version 2.5.2 to fix CVE-2026-23550 after Patchstack confirmed the flaw and contacted the vendor. The update removed URL-based route matching, drove routing entirely through validated filter logic, added a default 404 route, and made unrecognized requests fail safely.

Open Happening

Timeline

  1. 09.06.2026 17:00 2 articles · 1mo ago

    phpBB authentication bypass reported to vendor

    Initial Disclosure

    Dan Stefan Alexandru of Pentest-Tools.com discovered PTT-2026-004, a phpBB authentication bypass, and reported it to phpBB on June 4, 2026. The flaw can let an attacker hijack any account, including administrators, with a single unauthenticated request and no password, and it affects phpBB versions up to 3.3.16 in default database-authentication mode and the 4.0.0 alpha.

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  2. 09.06.2026 17:00 2 articles · 1mo ago

    phpBB 3.3.17 fixes the authentication bypass

    Mitigation Patch Update

    phpBB released version 3.3.17 on June 6, 2026, fixing PTT-2026-004 as the complete fix for the authentication bypass. Administrators were urged to upgrade vulnerable phpBB installations running versions up to 3.3.16 or the 4.0.0 alpha to remove the account-takeover risk.

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