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Advisory record · GHSA-4jwf-m4wg-8p66

Microsoft Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions

CVSS 9.3 CriticalCriticalEPSS 0.013 · 71st percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 24 Jul 2026, 15:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
Microsoft.OpenApi.KiotaNuGet>=1.30.0, <1.32.5 || <1.29.11.32.5, 1.29.1
Microsoft.OpenApi.Kiota.BuilderNuGet>=1.30.0, <1.32.5 || <1.29.11.32.5, 1.29.1
Identifiers
GHSA-4jwf-m4wg-8p66 · CVE-2026-59864
Weakness (CWE)
CWE-22 · CWE-829
Tags
Published
24 Jul 2026
Updated
17 Aug 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.3 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.013, the 71st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:21 UTC First seen by agentprime
  2. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.