microsoft prompty up to 2.0.0-beta.2 Loader loader.ts os command injection

Summaryinfo

A vulnerability was found in microsoft prompty up to 2.0.0-beta.2. It has been declared as critical. This affects an unknown part of the file runtime/typescript/packages/core/src/core/loader.ts of the component Loader. Executing a manipulation can lead to os command injection. This vulnerability is handled as CVE-2026-53597. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in microsoft prompty up to 2.0.0-beta.2. It has been declared as critical. This vulnerability affects some unknown processing of the file runtime/typescript/packages/core/src/core/loader.ts of the component Loader. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Prompty is a markdown file format (.prompty) for LLM prompts. From 2.0.0-alpha.1 until 2.0.0-beta.3, the @prompty/core TypeScript loader in runtime/typescript/packages/core/src/core/loader.ts used gray-matter without overriding executable js and javascript frontmatter engines, allowing an attacker-controlled .prompty file with ---js frontmatter to execute arbitrary JavaScript during prompt loading. This issue is fixed in version 2.0.0-beta.3.

The advisory is available at github.com. This vulnerability was named CVE-2026-53597 since 06/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/16/2026). This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 2.0.0-beta.3 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• microsoft

Name

• prompty

Version

• 2.0.0-beta.0
• 2.0.0-beta.1
• 2.0.0-beta.2

License

• commercial

Website

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

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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