LOW

GHSA-xjg6-5v39-v7fc

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

Details

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an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version). Thanks Winston Crooker for reporting.

Are you affected?

Enter the version of the package you're using.

Affected packages

Packagist / concrete5/concrete5

Introduced in: 0 Fixed in: 9.5.1

Fix composer require concrete5/concrete5:^9.5.1

References

https://nvd.nist.gov/vuln/detail/CVE-2026-8340 [ADVISORY]
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes [WEB]
https://github.com/concretecms/concretecms [PACKAGE]