high8.7
CVE-2026-59859
Microsoft Kiota: Code Generation Literal Injection in Kiota PHP Generator
Impact
Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 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 1.29.1 and 1.32.4.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.OpenApi.Kiota | >= 1.30.0, < 1.32.4 | 1.32.4 |
| nuget | Microsoft.OpenApi.Kiota.Builder | >= 1.30.0, < 1.32.4 | 1.32.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jqwh-526h-c92j
- https://github.com/microsoft/kiota/security/advisories/GHSA-jqwh-526h-c92j
- https://nvd.nist.gov/vuln/detail/CVE-2026-59859
- https://github.com/microsoft/kiota/pull/7863
- https://github.com/microsoft/kiota/commit/5e2a211ac4261988fbdc72c3b268596ea8837b87
- https://github.com/microsoft/kiota/releases/tag/v1.32.4