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Fencer Vulns
high 7.0

CVE-2026-59863 json

Kiota: Workspace-config poisoning: out-of-repo file write + generation-time SSRF

published 2026-07-16 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-44929 , GHSA-4rj6-vrwv-wr8m

cvss
7.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, Kiota honored a poisoned .kiota/workspace.json workspace configuration without validating per-client or per-plugin outputPath values during kiota client generate and kiota plugin generate, allowing a malicious repository or pull request to use absolute paths, rooted POSIX / paths, UNC \\ or // paths, Windows drive X:\ paths, or .. traversal segments to write generated client files outside the workspace root on a developer or CI host. This issue is fixed in version 1.29.1 and 1.32.5.

Patch / fix

  • nuget Microsoft.OpenApi.Kiota 1.29.1, 1.32.5
  • nuget Microsoft.OpenApi.Kiota.Builder 1.29.1, 1.32.5
  • microsoft kiota 1.29.1, 1.32.5
  • microsoft microsoft.openapi.kiota 1.29.1, 1.32.5
  • microsoft microsoft.openapi.kiota.builder 1.29.1, 1.32.5

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

1.37% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 7.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
CNA 4.0 7.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:L/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:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
nuget Microsoft.OpenApi.Kiota
>=1.30.0, <1.32.5
<1.29.1
1.32.5
1.29.1
nuget Microsoft.OpenApi.Kiota.Builder
>=1.30.0, <1.32.5
<1.29.1
1.32.5
1.29.1

Affected products

  • microsoft kiota

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory
  • CWE-829 Inclusion of Functionality from Untrusted Control Sphere
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.