CVE-2026-6826 — Concrete 9.5.0 and below has file usage disclosure via missing permission check in Usage controller

Description (CNA)

Concrete CMS 9.5.0 and below is vulnerable to unauthenticated file usage disclosure via missing permission check in the usage controller. Any unauthenticated visitor can request /ccm/system/dialogs/file/usage/{fID} with any file ID and receive a list of every page that references that file, including page IDs, handles, and full URLs. This includes pages that are otherwise restricted by permissions.The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.9 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Eldudareeno for reporting.

Affected (CNA)

Vendor / product	Versions
Concrete CMS / Concrete CMS	affected 5.0 through 9.5.0

CWE

CWE-200

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.