CVE-2026-44503

Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect

State: Published
Severity: 7.0 High
Published: May 14, 2026
Updated: May 14, 2026
Reserved: May 6, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	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	GitHub_M

Weaknesses

CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Affected Products

Product	Versions
kiota-javamicrosoft	< 1.9.1Affected
Microsoft.Kiota.Abstractionsmicrosoft	< 1.22.0Affected
github.com/microsoft/kiota-http-gomicrosoft	< 1.5.5Affected
kiota-typescriptmicrosoft	< 1.0.0-preview.100Affected
microsoft-kiota-abstractionsmicrosoft	< 1.9.1Affected
microsoft-kiota-httpmicrosoft	< 1.9.9Affected

References

https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9

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