What is CVE-2026-6826?

CVE-2026-6826 is a medium-severity vulnerability in Concrete Cms, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-05-21.

How severe is CVE-2026-6826?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Information disclosure in Concrete Cms

CVE-2026-6826

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 r…

Vulnerability class: Information Disclosure

EPSS: 0.000 (7.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Concrete Cms — versions 5.0
Concretecms Concrete_cms

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

ff5b8ace-8b95-4078-9743-eac1ca5451de (release-notes, Release Notes)

Frequently asked questions

What is CVE-2026-6826?: CVE-2026-6826 is a medium-severity vulnerability in Concrete Cms, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-05-21.
How severe is CVE-2026-6826?: Medium severity. CVSS v3 base score is 5.3 out of 10.