AIKIDO-2026-687567
Microsoft.OpenApi.Kiota.Builder is vulnerable to Path Traversal
93
Critical Risk
This Affects:
Microsoft.OpenApi.Kiota.BuilderTL;DR
Kiota writes the static_template.file value from the x-ai-adaptive-card and x-ai-capabilities OpenAPI extensions into a generated API plugin manifest without validating it. An attacker-controlled or tampered OpenAPI description can supply a .. traversal segment, absolute path, or URI, so the manifest's response_semantics.static_template.file references files outside the plugin package. When the generated plugin is deployed to a Microsoft 365 Copilot or Teams host, that host resolves the out-of-package path. The fix validates the reference as a relative path confined to the plugin output package and drops unsafe values.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you generate API plugin manifests from untrusted OpenAPI descriptions.
Background info
Microsoft.OpenApi.Kiota.Builder is vulnerable to Path Traversal in versions 0.0.1 - 1.32.4.
How to fix this
Upgrade the Microsoft.OpenApi.Kiota.Builder and/or the Microsoft.OpenApi.Kiota library to the patch version.
Links
GitHub Release
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