CVE-2026-6826: Concrete 9.5.0 and below has file usage disclosure via missing permission check in Usage controller
Vendor fix available · Affected: Concrete CMS · Exploitation: check available, not yet exploited
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 74% of scored CVEs
DescriptionCVE.org
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 receive a list of every page that references that file, including page IDs, handles, and full URLs. This includes pages that are otherwise restricted by permissions.The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.9 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Eldudareeno for reporting.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Concrete CMS · Concrete CMSVersions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
- CISA KEV
- Not listed
- Public check
- Concrete CMS <9.5.1 - Unauthenticated File Usage Disclosure · nuclei template in projectdiscovery/nuclei-templates
- Vendor
- Concrete CMS
- Published
- May 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-6826 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.