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HIGHCVE-2026-44503Published Modified CNA GitHub_M

CVE-2026-44503: Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect

The RedirectHandler middleware in microsoft/kiota-java (com.microsoft.kiota:microsoft-kiota-http-okHttp v1.9.0) and other Kiota libraries fails to strip sensitive HTTP headers when following 3xx redirects to a different host or scheme. Only the Authorization header is removed; Cookie, Proxy-Authorization, and all custom headers are forwarded to the redirect target.

Metrics

CVSS v4.0
7.0
Severity
HIGH
Fixed in
—
Affected Products
6
Affected packages
  • microsoft / kiota-java
    < 1.9.1
  • microsoft / Microsoft.Kiota.Abstractions
    < 1.22.0
  • microsoft / github.com/microsoft/kiota-http-go
    < 1.5.5
  • microsoft / kiota-typescript
    < 1.0.0-preview.100
  • microsoft / microsoft-kiota-abstractions
    < 1.9.1
  • microsoft / microsoft-kiota-http
    < 1.9.9
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
References