Vulnerabilities CVE-2026-8340

CVE-2026-8340

Low

Open

TLP:CLEAR

Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion

NVD CVE.org

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Description

Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion. Victim with edit_file_contents permission is CSRF'd into publishing an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version). 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 Winston Crooker for reporting.

Details

CVSS Score: 2.3
EPSS Score ⓘ: 0.10%

1.1th percentile
CVSS 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
Confidence: 90%
Published: May 22, 2026
Last Modified: May 22, 2026

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