Vulnerability Report

CVE-2026-48611

Title: Account Hijacking via OAuth improper authentication checks

Auth Bypass

Proof Of Concept

PoC Available for CVE-2026-48611

CWE Category CWE-287

Published Date Jun 12, 2026

Modified Date Jun 12, 2026

Exploit Status Available

Score 9.8 CVSS v3.0

Exploit Probability (EPSS)

0.42%

Vulnerability Summary

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.

Impacted Vendors

Analysis in Progress...

Reference Links

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

CVSS v3.0

Source Entity [email protected]

Severity CRITICAL

9.8

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-48611 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/citruscitruscitruscitruscitrusci/CVE-2026-48611-poc

View Code

June 12, 2026 MODIFIED

Vulnerability data updated via NVD.

June 12, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.