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CVE-2026-48611

CriticalPublished

Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to unauthorized...

Published: Jun 12, 2026
Updated: Jun 12, 2026
Assigning CNA: hackerone
Evidence observed: Aug 17, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.0

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

EPSS probability estimate

3.9%

Low · next 30 days

Percentile: 89.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

phpBB-CVE-2026-48611Exploit
Automated PoC for CVE-2026-48611 — phpBB OAuth login_link authentication bypass
CVE-2026-48611-EXPLOITExploit
CVE-2026-48611- authentication bypass in phpBB
CVE-2026-48611-phpBBExploit
Bypass Authentication

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