CVE-2026-8350

high

Published 2026-05-21 · Modified 2026-05-26

CVSS v3

8.8

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2

—

VIR risk

8.8

Description

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.

Predictions

Exploit likelihood

92%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: ff5b8ace-8b95-4078-9743-eac1ca5451de — https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

Application impact

Vendor	Product	Versions	Fixed
concretecms	concrete_cms	`{"endIncluding":"9.5.0"}`

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

CWEs

CWE-863

Verify integrity in audit chain (admin only). AS-IS.