Cross-site Request Forgery (CSRF) Affecting concrete5/concrete5 package, versions <9.5.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-CONCRETE5CONCRETE5-17705225
- published30 Jun 2026
- disclosed26 May 2026
- creditUnknown
Introduced: 26 May 2026
CVE-2026-8340 (opens in a new tab)How to fix?
Upgrade concrete5/concrete5 to version 9.5.1 or higher.
Overview
concrete5/concrete5 is a concrete5 open source CMS.
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) via the Backend\File::approveVersion function. An attacker can cause a victim with edit_file_contents permission to publish an attacker-chosen previously-uploaded version, such as downgrading to an older file version or activating a co-editor's unpublished version, by tricking the victim into performing an unintended action.