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CVE

CVE-2026-48611

9.8
CVSScritical
Exploitable remotely over the internet · no authentication required.
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.

Attack Vector
Network
Privileges Req.
None
User Interaction
None
phpbb
Updated Nov 10, 2026View on NVD →
S4E scanner

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. References: https://www.aikido.dev/blog/authentication-bypass-phpbb-technical-writeup https://nvd.nist.gov/vuln/detail/CVE-2026-48611 Remediation: Upgrade phpBB to version 3.3.17 or later.

10 assets checked · domain, subdomain, ipv4

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