CVE-2026-59861: Microsoft Kiota

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 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 1.29.1 and 1.32.0.

Affected products

• Microsoft Kiota: from 1.30.0, before 1.31.1 (fixed in 1.31.1); before 1.29.1 (fixed in 1.29.1)

Published 2026-07-16. Last modified 2026-08-17.