Microsoft Kiota up to 1.31.x Python Generator SetEnumOptions Description cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in Microsoft Kiota up to 1.31.x. This issue affects the function SetEnumOptions of the component Python Generator. This manipulation of the argument Description causes cross site scripting. This vulnerability is tracked as CVE-2026-59862. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Microsoft Kiota up to 1.31.x. It has been declared as problematic. Affected by this vulnerability is the function SetEnumOptions of the component Python Generator. The manipulation of the argument description with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.0, Kiota's Python generator let attacker-controlled enum value descriptions from x-ms-enum.values[].description flow through KiotaBuilder.SetEnumOptions into Documentation.DescriptionTemplate and PythonConventionService.RemoveInvalidDescriptionCharacters without newline sanitization, allowing generated inline comments to split and execute attacker-controlled Python code at module scope when generated modules were imported. This issue is fixed in version 1.32.0.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-59862 since 07/07/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is 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 T1059.007 for this issue.

Upgrading to version 1.32.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-44927). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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