Microsoft Prompty up to 2.0.0-beta.1 Loader path traversal

Summaryinfo

A vulnerability identified as problematic has been detected in Microsoft Prompty up to 2.0.0-beta.1. Impacted is an unknown function of the component Loader. This manipulation causes path traversal. The identification of this vulnerability is CVE-2026-53598. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Microsoft Prompty up to 2.0.0-beta.1. Affected by this vulnerability is some unknown functionality of the component Loader. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality. The summary by CVE is:

Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 2.0.0-beta.2, Prompty loaders expanded ${file:...} references in .prompty frontmatter without enforcing that resolved paths stayed within the prompt directory or allowed roots, allowing an attacker-controlled prompt file to read local files through absolute paths, .. traversal, or symlink escapes. This issue is fixed in versions 2.0.0-beta.2.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-53598 since 06/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/16/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 2.0.0-beta.2 eliminates this vulnerability.

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Productinfo

Vendor

• Microsoft

Name

• Prompty

Version

• 2.0.0-beta.0
• 2.0.0-beta.1

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://github.com/microsoft/prompty/

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