CVE-2026-8239

Vulnerability Description

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.

Related Weaknesses (CWE)

CWE-862

References

https://documentation.concretecms.org/9-x/developers/introduction/version-histor

FAQ

What is CVE-2026-8239?

CVE-2026-8239 is a documented vulnerability. 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 t...

How severe is CVE-2026-8239?

CVSS scoring is not yet available for CVE-2026-8239. Check NVD for updates.

Is there a patch for CVE-2026-8239?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.