CVE-2026-8239
Medium · 5.3CVSS
5.3
EPSS
0.3%
Published
May 21, 2026
CISA due date
—
The record
Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/get_rating' endpoint confirms existence and returns rating score for any message by ID. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Madani for reporting.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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