Security Advisory

CVE-2026-8238

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-05-21 21:04:50

Last updated 2026-05-22 12:30:59

Assigner ConcreteCMS

State PUBLISHED

Description

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The /ccm/frontend/conversations/message_page 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 Tristan Madani for reporting.

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