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Concrete CMS EUVD-2026-31349

| CVE-2026-8239 MEDIUM
Missing Authorization (CWE-862)
2026-05-21 ConcreteCMS GHSA-2xp7-rpvc-pjwc
Authentication Bypass
6.3
CVSS 4.0
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CVSS VectorNVD

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
May 21, 2026 - 22:44 vuln.today

DescriptionNVD

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/get_rating' endpoint confirms existence and returns rating score for any message by ID. 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.

AnalysisAI

Insecure Direct Object Reference (IDOR) in Concrete CMS 9.5.0 and earlier allows unauthenticated remote attackers to enumerate arbitrary conversation message IDs via the /ccm/frontend/conversations/get_rating endpoint, confirming message existence and leaking rating scores. The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:L) indicates no authentication is required but a prerequisite condition must be met - likely the Conversations module being enabled and publicly reachable. …

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EUVD-2026-31349 vulnerability details – vuln.today
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