CVE-2026-48611

9.8CRITICAL

Key Information:

Vendor

PHPbb

Status
PHPbb
Vendor
CVE Published:
12 June 2026

What is CVE-2026-48611?

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.

Affected Version(s)

phpBB 3.3.0 <= 3.3.16

References

https://www.phpbb.com/community/viewtopic.php?t=2672170

CVSS V3.0

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.