Vulnerabilities CVE-2026-6826

CVE-2026-6826

Medium

Open

TLP:CLEAR

Concrete 9.5.0 and below has file usage disclosure via missing permission check in Usage controller

NVD CVE.org

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Description

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.

Details

CVSS Score: 6.9
EPSS Score ⓘ: 0.56%

44.1th percentile
CVSS 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
Confidence: 90%
Published: May 21, 2026
Last Modified: May 22, 2026

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