CVE-2026-8340
Analyzed Analyzed - Analysis Complete
BaseFortify

Publication date: 2026-05-22

Last updated on: 2026-05-26

Assigner: ConcreteCMS

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an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version).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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-05-22
Last Modified
2026-05-26
Generated
2026-06-15
EPSS Evaluated
2026-06-14
NVD
CVE-2026-8340
EUVD
EUVD-2026-31441
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
concretecms concrete_cms to 9.5.1 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
AI Quick Actions have not been generated yet.
Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-8340. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart