High severity8.8NVD Advisory· Published May 21, 2026· Updated May 26, 2026
CVE-2026-8427
CVE-2026-8427
Description
Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file removeFavoriteFolder($id). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
concrete5/concrete5Packagist | >= 9.0.0RC1, < 9.5.1 | 9.5.1 |
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-67hj-8239-cmf5ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-8427ghsaADVISORY
- documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesnvdRelease NotesWEB
News mentions
1- Concrete CMS: 25 CVEs Disclosed Together, 12 High-Severity CSRF Bugs Lead the BatchVypr Intelligence · May 22, 2026