CVE-2026-59860

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

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS

1.4% chance of exploitation in the next 30 days; higher than 71% of CVEs (scores of 2026-10-25)

CWE

CWE-94

Published

2026-07-16

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

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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