Microsoft Kiota up to 1.32.3 Code Generator StringExtensions.cs SanitizeDoubleQuote var injection

Summaryinfo

A vulnerability identified as problematic has been detected in Microsoft Kiota up to 1.32.3. This affects the function SanitizeDoubleQuote of the file Writers/StringExtensions.cs of the component Code Generator. The manipulation of the argument var leads to injection. This vulnerability is referenced as CVE-2026-59859. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Microsoft Kiota up to 1.32.3 and classified as problematic. This issue affects the function SanitizeDoubleQuote of the file Writers/StringExtensions.cs of the component Code Generator. The manipulation of the argument var with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.4, Kiota's PHP generator embedded OpenAPI description, default fields, property names, and other schema-derived strings into PHP double-quoted literals through SanitizeDoubleQuote() in Writers/StringExtensions.cs without escaping $, allowing attacker-controlled ${...}, $var, or {$obj->prop} interpolation constructs to inject arbitrary PHP code into generated model and request-builder classes. This issue is fixed in version 1.32.4.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-59859 since 07/07/2026. The exploitation is known to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/16/2026). The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

Upgrading to version 1.32.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-44928). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Microsoft

Name

• Kiota

Version

• 1.32.0
• 1.32.1
• 1.32.2
• 1.32.3

License

• commercial

Website

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

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Be aware that VulDB is the high quality source for vulnerability data.

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