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Vulnerability record · CVE-2026-59864 · published 16 July 2026

CVE-2026-59864: Path traversal vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 1.3% · top 30.0% CWE-22 · Path traversalCWE-829 · Inclusion from untrusted sphere Deferred
9.3CVSS 4.0 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/microsoft/kiota/commit/9a185994a4e549b7bba3cc2beffb9736aa902e79
https://github.com/microsoft/kiota/pull/7892
https://github.com/microsoft/kiota/releases/tag/v1.32.5
https://github.com/microsoft/kiota/security/advisories/GHSA-4jwf-m4wg-8p66

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Source: NIST National Vulnerability Database (record CVE-2026-59864), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.