What is GHSA-xpgc-7vc2-8725?

GHSA-xpgc-7vc2-8725 is a security advisory published by GitHub Security Advisories with Medium severity. Concrete CMS 9.5.0 and below is vulnerable to IDOR. The `/ccm/frontend/conversations...

Which CVE IDs does GHSA-xpgc-7vc2-8725 cover?

GHSA-xpgc-7vc2-8725 covers the following CVE IDs: CVE-2026-8237. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

GHSA-xpgc-7vc2-8725Medium

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The `/ccm/frontend/conversations...

Vendor

GitHub Security Advisories

Published

May 22, 2026

Last Modified

May 22, 2026

🔗 CVE IDs covered (1)

CVE-2026-8237 →

📋 Description

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The `/ccm/frontend/conversations/message_detail` endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and the moderation queue. File attachments with download URLs are also exposed. 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 Eldudareeno for reporting.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-8237
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
https://github.com/advisories/GHSA-xpgc-7vc2-8725