CVE-2026-59864criticalCWE-22CWE-829

CVE-2026-59864: critical vulnerability in microsoft kiota

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

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.3epss 1.3%
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.
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
Affected products
microsoft · kiota
Related CVEs — microsoft kiota

In the same product, most dangerous first.

CVE-2026-59865CRITICALKiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota info`EPSS 4.4%CVE-2026-59867HIGHKiota: Generation-time SSRF + remote/local file inclusion via unrestricted $refEPSS 2.4%CVE-2026-73851MEDIUMKiota: Path traversal in generated plugin manifest static_template.file reference (percent-encoding bypass)EPSS 2.3%CVE-2026-59861HIGHKiota: Code Generation Literal Injection in Kiota Ruby GeneratorEPSS 2.0%CVE-2026-59866CRITICALKiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clientNamespaceNameEPSS 1.4%CVE-2026-59859HIGHKiota: Code Generation Literal Injection in the PHP GeneratorEPSS 1.4%