Microsoft Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
Critical vendor advisory
CVE-2026-59864
Summary
Microsoft Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
Why it matters
GitHub has published a reviewed security advisory for Microsoft.OpenApi.Kiota. Prioritize it with other application dependency updates, especially because EPSS places it in the 67% percentile.
Operator check
Check whether Microsoft.OpenApi.Kiota is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 9.3. EPSS probability: 1.3%; percentile: 67%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.