Mockoon up to 9.6.x File Path Validator server.ts getSafeFilePath filePath path traversal

Summaryinfo

A vulnerability was found in Mockoon up to 9.6.x. It has been rated as problematic. Affected by this issue is the function getSafeFilePath of the file packages/commons-server/src/libs/server/server.ts of the component File Path Validator. The manipulation of the argument filePath leads to path traversal. This vulnerability is traded as CVE-2026-59149. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Mockoon up to 9.6.x. It has been rated as problematic. This issue affects the function getSafeFilePath of the file packages/commons-server/src/libs/server/server.ts of the component File Path Validator. The manipulation of the argument filePath with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. Impacted is confidentiality. The summary by CVE is:

Mockoon provides way to design and run mock APIs. Prior to 9.7.0, a FILE response whose filePath embeds request data is confined by getSafeFilePath in packages/commons-server/src/libs/server/server.ts with resolvedPath.startsWith(staticBaseDir). That prefix test has no path-separator boundary, so a ../-escaped path whose absolute form string-prefixes the base directory passes, allowing an unauthenticated client to read files from sibling paths outside the served directory through HTTP sendFile, WebSocket, or callbacks. This issue is fixed in version 9.7.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-59149 since 07/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 9.7.0 eliminates this vulnerability.

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Productinfo

Name

• Mockoon

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6

Website

• Product: https://github.com/mockoon/mockoon/

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