CVE-2026-8350NVD

Vulnerability Summary

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.

Severity Level

HIGH

Published Date

May 21, 2026

Last Modified

Jun 24, 2026

Exploitation Status

No confirmed exploitation yet

CVE Record Status

Published

EPSS Score (30-Day)

0.30%Probability

Root Weakness (CWE)

CWE-863: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v4.0 Base Metrics — Score 7.5

Attack VectorNetwork

Attack ComplexityLow

Attack RequirementsPresent

Privileges RequiredHigh

User InteractionNone

Confidentiality (Vulnerable System)High

Integrity (Vulnerable System)High

Availability (Vulnerable System)High

Confidentiality (Subsequent System)None

Integrity (Subsequent System)None

Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions

concrete5/concrete5 < 9.5.1

Patched Versions

Not provided by Private for this CVE.

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