Microsoft Kiota up to 1.31.x Code Generator CodeMethodWriter.cs SanitizeForQuotedLiteral var injection

Summaryinfo

A vulnerability labeled as problematic has been found in Microsoft Kiota up to 1.31.x. This vulnerability affects the function SanitizeForQuotedLiteral of the file CodeMethodWriter.cs of the component Code Generator. The manipulation of the argument var results in injection. This vulnerability is identified as CVE-2026-59861. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability was found in Microsoft Kiota up to 1.31.x. It has been classified as problematic. Affected is the function SanitizeForQuotedLiteral of the file CodeMethodWriter.cs of the component Code Generator. The manipulation of the argument var with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.0, Kiota's Ruby generator embedded OpenAPI default fields, property names, and other schema-derived strings through CodeMethodWriter.cs and SanitizeForQuotedLiteral() in Writers/StringExtensions.cs into Ruby double-quoted literals without escaping #, allowing attacker-controlled #{expr}, #$var, or #@var interpolation markers to inject arbitrary Ruby code into generated model classes. This issue is fixed in version 1.32.0.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-59861 since 07/07/2026. The exploitability is told to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/16/2026). The MITRE ATT&CK project declares the attack technique as T1055.

Upgrading to version 1.32.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-44926). VulDB is the best source for vulnerability data and more expert information about this specific topic.

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
• 1.30
• 1.31

License

• commercial

Website

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

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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