CVE-2026-59859
High
Description
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductMicrosoft.openapi.kiota
PublishedJul 16, 2026
First seenJul 16, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- Microsoft.OpenApi.Kiota1.32.4, 1.29.1 or later
- Microsoft.OpenApi.Kiota.Builder1.32.4, 1.29.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft.OpenApi.KiotaNuGet | 1.30.0 ≤ v < 1.32.4, v < 1.29.1 | 1.32.4, 1.29.1 |
| Microsoft.OpenApi.Kiota.BuilderNuGet | 1.30.0 ≤ v < 1.32.4, v < 1.29.1 | 1.32.4, 1.29.1 |
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