CVE-2023-32679: Remote Code Execution via unrestricted file extension in Craft CMS

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-05-19 · updated 2026-06-17
Weakness: CWE-74

Description

Craft CMS is an open source content management system. In affected versions of Craft CMS an unrestricted file extension may lead to Remote Code Execution. If the name parameter value is not empty string('') in the View.php's doesTemplateExist() -> resolveTemplate() -> _resolveTemplateInternal() -> _resolveTemplate() function, it returns directly without extension verification, so that arbitrary extension files are rendered as twig templates. When attacker with admin privileges on a DEV or an improperly configured STG or PROD environment, they can exploit this vulnerability to remote code execution. Code execution may grant the attacker access to the host operating system. This issue has been addressed in version 4.4.6. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

craftcms cms: from 4.0.0 before 4.4.6 — fixed in 4.4.6

How to fix

Upgrade to a fixed version: craftcms cms 4.4.6. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2023-32679 or the next vulnerability affects your stack