CVE-2026-8427: Concrete CMS is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file removeFavoriteFolder($id)

May 22, 2026 (updated June 24, 2026)

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file removeFavoriteFolder($id).

References

documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
github.com/advisories/GHSA-67hj-8239-cmf5
nvd.nist.gov/vuln/detail/CVE-2026-8427

Code Behaviors & Features

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