CVE-2026-8236 Scanner.
Concrete CMS <9.5.1 - Unauthenticated File-Usage Internal Metadata Disclosure
Free and read-only. Scan only sites you own or are allowed to test.
What This Check Does.
Read-only
It only asks your site for public pages, the way a browser would. Nothing is changed, uploaded or stored.
Up to 1 request
A small, fixed number of requests, so the check is quick and will not load your site.
Looks for CVE-2026-8236
It looks for the specific sign of this one vulnerability and ends with a clear answer: vulnerable, not vulnerable, or could not be determined.
About CVE-2026-8236. What It Means.
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.
More CVEs In Concretecms Concrete CMS.
FAQ
Common Questions.
Concrete CMS <9.5.1 - Unauthenticated File-Usage Internal Metadata Disclosure. 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.
Atlas sends up to 1 read-only request to your site and looks for the specific sign of CVE-2026-8236 in Concretecms Concrete CMS. Nothing is changed, uploaded or stored on your site.
CVE-2026-8236 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing. Its CVSS score is 5.3.
Yes. The check only reads public pages, the same way a browser or a search engine would. Scan only sites you own or are allowed to test.
It means no sign of CVE-2026-8236 was found by this read-only check. It does not prove the site is free of other weaknesses.
Update Concretecms Concrete CMS to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. The vendor links and details are in the CVE-2026-8236 briefing linked on this page.
Scan only sites you own or have written permission to test. A result of Not Vulnerable means this read-only check found no sign of CVE-2026-8236; it is not a guarantee that the site is secure.