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.
Concrete CMS References: https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes https://github.com/advisories/GHSA-xpgc-7vc2-8725 https://nvd.nist.gov/vuln/detail/CVE-2026-8237 Remediation: Update to a version later than 9.5.0 or the latest available version
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