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Vulnerability record · CVE-2026-59860 · published 16 July 2026

CVE-2026-59860: Code injection vulnerability

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.

8.7 CVSS 4.0 High EPSS 1.4% · top 29.0% CWE-94 · Code injection Deferred
8.7CVSS 4.0 base score
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-59860), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.