Craft CMS vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior
Vulnerability Description
Craft is a platform for creating digital experiences. Versions 5.0.0-RC1 through 5.8.20 and 4.0.0-RC1 through 4.16.16 are vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior. Note that attackers must have administrator access to the Craft Control Panel for this to work. Users should update to the patched versions (5.8.21 and 4.16.17) to mitigate the issue.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
Am I Vulnerable?
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://github.com/craftcms/cms/security/advisories/GHSA-255j-qw47-wjh5
- https://github.com/craftcms/cms/commit/27f55886098b56c00ddc53b69239c9c9192252c7
- https://github.com/craftcms/cms/commit/6e608a1a5bfb36943f94f584b7548ca542a86fef
- https://github.com/craftcms/cms/commit/ec43c497edde0b2bf2e39a119cded2e55f9fe593
- https://github.com/craftcms/cms/blob/5.x/CHANGELOG.md#5821---2025-12-04
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craftcms
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Timeline
CVSS Vectors
Weaknesses (CWE)
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.