What is CVE-2026-8236?

CVE-2026-8236 is a medium-severity vulnerability in Concrete Cms, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-05-21.

How severe is CVE-2026-8236?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Concrete Cms

CVE-2026-8236

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, ver…

Vulnerability class: Broken Access Control

EPSS: 0.001 (25.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Concrete Cms — versions 5
Concretecms Concrete_cms

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

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

Frequently asked questions

What is CVE-2026-8236?: CVE-2026-8236 is a medium-severity vulnerability in Concrete Cms, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-05-21.
How severe is CVE-2026-8236?: Medium severity. CVSS v3 base score is 4.3 out of 10.