CVE-2026-8239
MEDIUM WAF: Low
CVSS 5.3
Published: 2026-05-21
CWE-862
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.
WAF Coverage Analysis
Missing Authorization
Low WAF Coverage
OWASP: A01:2021 Broken Access Control
Affected Software
| Vendor | Product | Version |
|---|---|---|
| concretecms | concrete_cms | up to 9.5.1 |
References
- documentation.concretecms.org (Release Notes)