CVE-2026-48611 — CRITICAL (9.8)

Vulnerability 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.

CVSS Score

9.8

CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-287

References

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

FAQ

What is CVE-2026-48611?

CVE-2026-48611 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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.

How severe is CVE-2026-48611?

CVE-2026-48611 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-48611?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.