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Concrete CMS EUVD-2026-31347

| CVE-2026-8236 MEDIUM
Missing Authorization (CWE-862)
2026-05-21 ConcreteCMS GHSA-58c8-vvqw-cm7m
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 - 22:41 vuln.today

DescriptionNVD

Concrete CMS 9.5.0 and below is vulnerable to IDOR combined with a missing authentication gate. The endpoint /ccm/system/dialogs/file/usage/{fID} accepts an integer file ID in the URL and returns internal site structure data (page IDs, versions, URL paths) to anyone who sends a GET request. 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 Winston Crooker for reporting.

AnalysisAI

{fID} endpoint without any credentials. The flaw combines CWE-862 (Missing Authorization) with a classic IDOR pattern on an integer file ID parameter, and is scored CVSS 4.0 at 6.3 (Medium) by the vendor with PR:N and AC:L, though the AT:P metric indicates that valid file IDs must exist for meaningful data to be returned. …

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EUVD-2026-31347 vulnerability details – vuln.today
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