CVE-2026-8236
Concrete CMS 9.5.0 and below is vulnerable to IDOR combined with a missing authentication gate for endpoint /ccm/system/dialogs/file/usage/{fID}
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-862 |
| Vendor | concrete cms |
| Product | concrete cms |
| Published | May 21, 2026 |
| Last Updated | May 22, 2026 |
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Affected Versions
Concrete CMS / Concrete CMS
5 ≤ 9.5.0
References
Credits
Winston Crooker