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}
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-8236?
The severity of CVE-2026-8236 is medium with a CVSS score of 6.3.
How do I fix CVE-2026-8236?
To fix CVE-2026-8236, upgrade Concrete CMS to version 9.5.1 or later.
What is affected by CVE-2026-8236?
CVE-2026-8236 affects Concrete CMS versions 9.5.0 and below.
What type of vulnerability is CVE-2026-8236?
CVE-2026-8236 is an IDOR vulnerability combined with a missing authentication gate.
What data can be exposed by CVE-2026-8236?
CVE-2026-8236 can expose internal site structure data including page IDs, versions, and URL paths.