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Medium severity5.3NVD Advisory· Published May 21, 2026· Updated Jul 23, 2026

CVE-2026-8239

CVE-2026-8239

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
concrete5/concrete5Packagist
< 9.5.19.5.1

Affected products

3
  • Concrete5/Concrete52 versions
    cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*range: <9.5.1
    • (no CPE)range: <=9.5.0
  • Concrete CMS/Concrete CMSllm-fuzzy
    Range: <=9.5.0

Patches

Vulnerability mechanics

References

3

News mentions

1