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CVE-2026-8237

MediumPublished

Concrete CMS 9.5.0 and below is vulnerable to IDOR in the/ccm/frontend/conversations/message_detail endpoint

Published: May 21, 2026
Updated: May 22, 2026
Assigning CNA: ConcreteCMS
Evidence observed: Aug 8, 2026

Primary CVSS

6.3/ 10Medium

nvd · CVSS 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 48.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-8237Informational
In-depth IDOR write-up for Concrete CMS, covering the message_detail endpoint, missing authorization root cause, attack scenarios, impact, and fix.

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