What is CVE-2026-8435?

CVE-2026-8435 is a medium-severity vulnerability in Concrete Cms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2026-05-21.

How severe is CVE-2026-8435?

Medium severity. CVSS v3 base score is 6.5 out of 10.

CSRF in Concrete Cms

CVE-2026-8435

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file approveVersion(). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV…

Vulnerability class: CSRF (Cross-Site Request Forgery)

EPSS: 0.000 (4.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

Affected products

Concrete Cms — versions 9.0
Concretecms Concrete_cms

Weakness classification (CWE)

References

ff5b8ace-8b95-4078-9743-eac1ca5451de (release-notes, Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8435?: CVE-2026-8435 is a medium-severity vulnerability in Concrete Cms, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2026-05-21.
How severe is CVE-2026-8435?: Medium severity. CVSS v3 base score is 6.5 out of 10.