by Kastro
Paper/Archive/CVE-2026-59864

CVE-2026-59864

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

EPSS 1%CVSS 9.3
critical.is priorityof 100
42
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 71.1.711 × 2014.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, `kiota plugin add` and `kiota plugin generate` (with `-t APIPlugin`) emitted attacker-controlled static_template.file values from x-ai-adaptive-card and x-ai-capabilities into generated Microsoft 365 Copilot and Teams plugin manifests without path validation, allowing ../, absolute, rooted, UNC, Windows drive, or URI paths in response_semantics.static_template.file to cause path traversal or out-of-package file inclusion when the generated plugin was deployed. This issue is fixed in version 1.29.1 and 1.32.5.

Affected

ProductAffectedFixed inSource
kiota>= 1.30.0, < 1.31.1–CNA
kiota< 1.29.1–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/microsoft/kiota/security/advisories/GHSA-4jwf-m4wg-8p66refgithub.com/microsoft/kiota/pull/7892refgithub.com/microsoft/kiota/commit/9a185994a4e549b7bba3cc2beffb9736aa902e79refgithub.com/microsoft/kiota/releases/tag/v1.32.5