EUVD-2026-354319

fkie_cve-2026-59864

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.

GHSA-4jwf-m4wg-8p66 — Microsoft Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions

Affected: NuGet: Microsoft.OpenApi.Kiota, NuGet: Microsoft.OpenApi.Kiota.Builder

### Summary

`kiota plugin add` / `kiota plugin generate` (with `-t APIPlugin`) emits an attacker-controlled `static_template.file` path from the AI-plugin extensions (`x-ai-adaptive-card`, `x-ai-capabilities`) **verbatim**, with no path validation, into the generated Microsoft 365 Copilot / Teams plugin manifest (`<name>-apiplugin.json`). An attacker-controlled or compromised OpenAPI description can therefore embed a `../` / absolute path into the manifest's `response_semantics.static_template.file`, yielding a **path traversal (CWE-22)** / out-of-package file inclusion (CWE-829) that is resolved by the AI host when the generated plugin is deployed.

Confirmed on Kiota **1.32.4** (`KIOTA_CONFIG_PREVIEW=true`, the self-contained `linux-x64` release binary).

### Details

Both extension paths write the `static_template.file` reference straight into the manifest without sanitization — `PluginsGenerationService.GetResponseSemanticsFromAdaptiveCardExtension` mints `static_template = {"file": <File>}`, and the `x-ai-capabilities` path copies the `static_template` object through:

``` # spec -> generated manifest (functions[].capabilities.response_semantics) x-ai-adaptive-card: {title: T, data_path: $.x, file: "../../../../../../etc/passwd"} -> static_template.file = "../../../../../../etc/passwd" (CWE-22) x-ai-capabilities.response_semantics.static_template: {file: "../../../../../../etc/passwd"}…

Most recent entries from all

EUVD-2026-354319

fkie_cve-2026-59864

GHSA-4jwf-m4wg-8p66 — Microsoft Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions