Craft CMS prior 5.10.6/4.18.2 Local File System ensurePathIsContained path traversal

Summaryinfo

A vulnerability described as critical has been identified in Craft CMS CMS. Affected is the function ensurePathIsContained of the component Local File System. The manipulation results in path traversal. This vulnerability is cataloged as CVE-2026-72783. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Craft CMS CMS. Affected is the function ensurePathIsContained of the component Local File System. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Craft CMS versions >= 5.0.0-RC1 before 5.10.6 and >= 4.0.0-RC1 before 4.18.2 contain a theoretical path traversal weakness in the ensurePathIsContained function of the Local file system class. The order of operations validates the path before normalization, so normalization could invalidate prior validation assumptions (a desanitization-style issue) and potentially resolve to files outside the intended volume directory. The vendor notes the issue is not directly exploitable and no exploitable scenario has been discovered; the fix is recommended for hardening.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-72783 since 08/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 5.10.6 or 4.18.2 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• Craft CMS

Name

• CMS

License

• free

CPE 2.3info

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CPE 2.2info

• 🔒

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