CVE-2026-59867: Path Traversal (CVSS 7.1)

Description

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.5, Kiota resolved OpenAPI $ref values by fetching remote http(s) URLs and reading local absolute or out-of-tree file paths, allowing `kiota generate` on an attacker-controlled or attacker-influenced description to perform build-time SSRF, remote file inclusion, and local file inclusion by inlining external schemas such as REMOTE_KIOTA_PROP or Leaked into generated clients. This issue is fixed in version 1.32.5 by AllowedExternalOriginsStreamLoader and the --allowed-external-origins option.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

EPSS — Exploit Prediction

0.0192

Probability of exploitation

0.78%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

CWE-829 CWE-829

CWE-918 Server-Side Request Forgery (SSRF)

References

Other References

https://github.com/microsoft/kiota/commit/cccd798027f0a20db796b3df6c64f9897a39d7b1 https://github.com/microsoft/kiota/pull/7888 https://github.com/microsoft/kiota/releases/tag/v1.32.5 https://github.com/microsoft/kiota/security/advisories/GHSA-rg4h-fpcp-2qm8

Frequently Asked Questions

What is CVE-2026-59867? +

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.32.5, Kiota resolved OpenAPI $ref values by fetching remote http(s) URLs and reading local absolute or out-of-tree file paths, allowing `kiota generate` on an attacker-controlled or attacker-influenced description to perform build-time SSRF, remote file inclusion, and local file inclusion by inlining external schemas such as REMOTE_KIOTA_PROP or Leaked into generated clients. This issue is fixed in version 1.32.5 by AllowedExternalOriginsStreamLoader and the --allowed-external-origins option. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-59867? +

CVE-2026-59867 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0192, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-59867? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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