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High severity8.8NVD Advisory· Published May 21, 2026· Updated May 26, 2026

CVE-2026-8434

CVE-2026-8434

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
concrete5/concrete5Packagist
>= 9.0.0RC1, < 9.5.19.5.1

Affected products

2
  • Concrete5/Concrete5inferred2 versions
    <9.5.0+ 1 more
    • (no CPE)range: <9.5.0
    • (no CPE)range: >=9, <9.5.0

Patches

Vulnerability mechanics

References

3

News mentions

1