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PHP EUVDEUVD-2026-31343

| CVE-2026-8350 HIGH
Incorrect Authorization (CWE-863)
2026-05-21 ff5b8ace-8b95-4078-9743-eac1ca5451de GHSA-g7xp-jf3x-wcx4
PHP Authentication Bypass Privilege Escalation
7.5
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
May 21, 2026 - 21:33 vuln.today

DescriptionCVE.org

Concrete CMS 9.5.0 and below is vulnerable to missing authorization in the bulk_user_assignment.php which can lead to privilege escalation to Administrative Group. Any authenticated user with access to the bulk user assignment dashboard page can add any user email to any group and can remove legitimate admins. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 7.5 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Vincent55 for reporting.

AnalysisAI

Privilege escalation in Concrete CMS 9.5.0 and earlier allows authenticated users with access to the bulk user assignment dashboard to add arbitrary accounts to the Administrators group and remove existing admins, effectively hijacking site control. The flaw stems from missing authorization checks in bulk_user_assignment.php and was disclosed with a vendor-assigned CVSS v4.0 score of 7.5. No public exploit identified at time of analysis, and the issue is not present in CISA KEV.

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EUVD-2026-31343 vulnerability details – vuln.today
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