phpBB vulnerabilities

5 known vulnerabilities in phpBB from phpBB. 5 are rated high or critical. Each entry lists the affected versions and the release that fixes it, where the vendor has published one.

Latest first

• 8.0 High severity

  phpBB: Cross-Site Request Forgery

  CVE-2026-48612Jun 12, 2026phpBB

  Improper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account. This can result in unauthorized account linking and potential acc

• 9.8 Critical severity

  phpBB: Improper Authentication

  CVE-2026-48611Jun 12, 2026phpBBEPSS 3.86%

  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.

• 7.2 High severity

  phpBB: Improper Access Control

  CVE-2026-47366Jun 12, 2026phpBB

  Improper verification of access permissions when modifying permissions through the Administration Control Panel (ACP) allowed an authenticated administrator to grant permissions beyond the level authorized for their account, resulting in privilege escalation w

• 8.1 High severity

  phpBB: Weak Password Recovery Mechanism for Forgotten Password

  CVE-2026-29199May 4, 2026phpBB

  phpBB before 3.3.16 is vulnerable to Host Header Injection that can lead to password rest link poisoning. When force_server_vars is disabled, the servers hostname may be extracted from the HTTP Host header which is used to generate the password reset link URL.

• 8.8 High severity

  Phpbb: Cross-Site Request Forgery

  CVE-2025-70810Apr 9, 2026phpBB

  Cross Site Request Forgery vulnerability in Phpbb phbb3 v.3.3.15 allows a local attacker to execute arbitrary code via the login function and the authentication mechanism