phpBB 3.3.17

Thousands of phpBB Forums Exposed by Critical Authentication Bypass

phpBB authentication bypass CVE-2026-48611, account takeover, OAuth vulnerability

Thousands of phpBB Forums Exposed by Critical Authentication Bypass

Do Son June 16, 2026

A critical phpBB authentication bypass (CVE-2026-48611) lets attackers hijack any account on thousands of forums. Update to 3.3.17 now.

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