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PatchSiren cyber security CVE debrief

CVE-2026-59863 microsoft CVE debrief

CVE-2026-59863 is a vulnerability in Kiota, an OpenAPI based HTTP Client code generator. Prior to version 1.32.5, Kiota did not validate per-client or per-plugin outputPath values during kiota client generate and kiota plugin generate, allowing a malicious repository or pull request to write generated client files outside the workspace root on a developer or CI host. This issue enables attackers to potentially write files to arbitrary locations on the system, posing a significant risk.

Vendor
microsoft
Product
kiota
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-16
Original CVE updated
2026-07-16
Advisory published
2026-07-16
Advisory updated
2026-07-16

Who should care

Developers and users of Kiota, an OpenAPI based HTTP Client code generator, should be aware of this vulnerability and take steps to ensure they are using a version of Kiota that is not vulnerable. This includes upgrading to version 1.32.5 or later and validating per-client or per-plugin outputPath values.

Technical summary

The vulnerability in Kiota, an OpenAPI based HTTP Client code generator, allowed a malicious repository or pull request to write generated client files outside the workspace root on a developer or CI host due to a lack of validation of per-client or per-plugin outputPath values during kiota client generate and kiota plugin generate. This issue enables attackers to potentially write files to arbitrary locations on the system, posing a significant risk. The issue has been fixed in version 1.32.5, addressing path traversal concerns. Developers should verify their Kiota version usage and ensure per-client or per-plugin outputPath values are validated to prevent similar vulnerabilities. Evidence is limited to CVE.org and NVD details, so defenders should focus on upgrading Kiota to version 1.32.5 or later and implementing secure practices for repository and pull request sources.

Defensive priority

High

Recommended defensive actions

  • Upgrade to Kiota version 1.32.5 or later
  • Validate per-client or per-plugin outputPath values
  • Use secure repository and pull request sources
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-16T15:16:35.707Z and has not been modified since then. The NVD entry is currently Deferred. Evidence is limited to CVE.org and NVD details. Defenders should verify Kiota version usage and validate per-client or per-plugin outputPath values.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-16T15:16:35.707Z and has not been modified since then.