Microsoft Kiota up to 1.29.0/1.33.x path traversal

Summaryinfo

A vulnerability labeled as problematic has been found in Microsoft Kiota up to 1.29.0/1.33.x. This issue affects some unknown processing. The manipulation results in path traversal. This vulnerability is identified as CVE-2026-73851. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Microsoft Kiota up to 1.29.0/1.33.x. Affected is an unknown part. 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. CVE summarizes:

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.34.0, an attacker who controls or tampers with the OpenAPI description consumed by Kiota can supply a file reference that resolves outside the manifest package (e.g. ../../../../etc/passwd, an absolute path, or a file:// / http(s):// URI). When the generated manifest is deployed and consumed by an AI host, this can lead to inclusion or disclosure of files outside the intended package boundary. This vulnerability is fixed in 1.29.1 and 1.34.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-73851 since 08/13/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/17/2026). The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 1.29.1 or 1.34.0 eliminates this vulnerability.

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Productinfo

Vendor

• Microsoft

Name

• Kiota

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.29.0
• 1.30
• 1.31
• 1.32
• 1.33

License

• commercial

Website

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

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