CVE-2026-8238

MediumCVSS 5.3/10Last modified Jul 23, 2026

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-862

Affected software

VendorProductVersions
Concrete CMSConcrete CMS>= 5.0, <= 9.5.0

References

Timeline

Published
May 21, 2026
Last modified
Jul 23, 2026
NVD status
Analyzed

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CVE-2026-8238: Medium severity, CVSS 5.3 | Vulnix