critical9.3
CVE-2026-59864
Microsoft Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.OpenApi.Kiota | >= 1.30.0, < 1.32.5 | 1.32.5 |
| nuget | Microsoft.OpenApi.Kiota.Builder | >= 1.30.0, < 1.32.5 | 1.32.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4jwf-m4wg-8p66
- https://github.com/microsoft/kiota/security/advisories/GHSA-4jwf-m4wg-8p66
- https://nvd.nist.gov/vuln/detail/CVE-2026-59864
- https://github.com/microsoft/kiota/pull/7892
- https://github.com/microsoft/kiota/commit/9a185994a4e549b7bba3cc2beffb9736aa902e79
- https://github.com/microsoft/kiota/releases/tag/v1.32.5