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CVE-2026-48611

Published: Jun 12, 2026Updated: Jun 12, 2026 Sources: CVE List NVDCWE-287
9.8CRITICAL
NVD MITRE
EPSS Score
3.9%
Top 10.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Nuclei · OpenVAS

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.

In plain language

AI Worth attention

CVE-2026-48611 is a serious phpBB login/account takeover issue that can affect even default installs, so you should act soon and get to the patched version.

What to do

  1. Update phpBB to the patched version your vendor provides for CVE-2026-48611. 2) If you can’t update immediately, ask your IT person to confirm whether your current OAuth/account-related code paths are affected and apply any vendor-recommended mitigations. 3) Check with whoever maintains your phpBB for the specific upgrade target and document when you applied it.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-287

Affected Products

phpBB
oss-project
phpBBOn-premWeb App
Web & CMS Plugins / cms-core

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://www.phpbb.com/community/viewtopic.php?t=2672170
phpbb.com
News mentions
2

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