What’s Vulnerable › Vulnerabilities

CVE-2026-59860: Kiota: XML Doc-Comment Newline Breakout Code Injection

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-16 · updated 2026-10-24
• Weakness: CWE-94

Description

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.3, Kiota is affected by a code-generation injection vulnerability in the C# XML documentation-comment sink (the description, externalDocs label, and externalDocs link fields emitted as /// … comments). When text from an OpenAPI description is written into single-line XML doc comments without stripping newline and Unicode line-terminator characters, an attacker can break out of the /// comment line and inject additional code into generated C# clients. This issue is fixed in version 1.29.1 and 1.32.3.

Affected products

• microsoft kiota: from 1.30.0, < 1.31.1; before 1.29.1

References

• https://github.com/microsoft/kiota/commit/ebb632db90aa8e3c20949337d9faa2720d64ca44
• https://github.com/microsoft/kiota/pull/7831
• https://github.com/microsoft/kiota/releases/tag/v1.32.3
• https://github.com/microsoft/kiota/security/advisories/GHSA-3hrf-2gc2-mx32
• https://github.com/microsoft/kiota/security/advisories/GHSA-3hrf-2gc2-mx32

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