Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M

CVE-2026-59859Kiota: Code Generation Literal Injection in the PHP Generator

High 8.7

In plain English

A high-severity code injection in kiota from microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)1.4%top 27.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
NuGet	microsoft.openapi.kiota	1.32.4	GHSA-jqwh-526h-c92j
NuGet	microsoft.openapi.kiota	1.29.1	GHSA-jqwh-526h-c92j
NuGet	microsoft.openapi.kiota.builder	1.32.4	GHSA-jqwh-526h-c92j
NuGet	microsoft.openapi.kiota.builder	1.29.1	GHSA-jqwh-526h-c92j

Affected products (as reported)

Vendor	Product	Versions
microsoft	kiota	>= 1.30.0, < 1.31.1< 1.29.1

Weakness: CWE-94 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/microsoft/kiota/security/advisories/GHSA-jqwh-526h-c92j x_refsource_CONFIRM
https://github.com/microsoft/kiota/pull/7863 x_refsource_MISC
https://github.com/microsoft/kiota/commit/5e2a211ac4261988fbdc72c3b268596ea8837b87 x_refsource_MISC
https://github.com/microsoft/kiota/releases/tag/v1.32.4 x_refsource_MISC