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Medium · 6.3 Public exploit CVE-2026-8239 EUVD-2026-31349GHSA-2xp7-rpvc-pjwc

Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/get_rating'

Published May 21, 2026 · Updated May 22, 2026 · Assigned by ConcreteCMS

Vendor: Concrete CMS Product: Concrete CMS Package: concrete5/concrete5 Ecosystem: Packagist

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.

Affected products

VendorProductAffectedFixed
Concrete CMS Concrete CMS — —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • aj2108/CVE-2026-8239 ★ 0 · Aug 1, 2026

    CVE-2026-8239 is an Insecure Direct Object Reference (IDOR) vulnerability affecting Concrete CMS 9.5.0 and earlier.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist concrete5/concrete5 < 9.5.1 9.5.1 GHSA-2xp7-rpvc-pjwc

References