CVE-2026-8434: Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file rescanMultiple()
Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file rescanMultiple(). 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Concrete CMSto a version that resolves this vulnerability.Fixed in 9.5.0
Event History
Frequently Asked Questions
What is the risk assessment of CVE-2026-8434?
CVE-2026-8434 has a low severity rating of 2.3 according to the CVSS v4.0 scoring system.
What type of vulnerability is CVE-2026-8434?
CVE-2026-8434 is a Cross Site Request Forgery (CSRF) vulnerability affecting Concrete CMS 9 before version 9.5.0.
How does CVE-2026-8434 affect Concrete CMS?
CVE-2026-8434 can potentially allow an attacker to execute unauthorized actions on behalf of an authenticated user in Concrete CMS.
Is there a fix for CVE-2026-8434?
To resolve CVE-2026-8434, users should upgrade their Concrete CMS to version 9.5.0 or later.
When was CVE-2026-8434 published?
CVE-2026-8434 was published on May 21, 2026.