EUVD-2026-31343
GHSA-g7xp-jf3x-wcx4
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
Lifecycle Timeline
1DescriptionNVD
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. …
Sign in for full analysis, threat intelligence, and remediation guidance.
RemediationAI
24 hours: Audit all users with bulk user assignment dashboard access and restrict permissions to essential administrators only; review recent changes to admin accounts. 7 days: Disable the bulk user assignment feature if not actively required; implement access controls requiring multi-party approval for admin account modifications. …
Sign in for detailed remediation steps.
Share
External POC / Exploit Code
Leaving vuln.today