CVE-2026-59864

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

State: Published
Severity: 9.3 Critical
Published: Jul 16, 2026
Updated: Aug 17, 2026
Reserved: Jul 7, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	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	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-829 Inclusion of Functionality from Untrusted Control Sphere

Affected Products

Product	Versions
kiotamicrosoft	>= 1.30.0, < 1.31.1Affected < 1.29.1Affected

References

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