CVE-2026-44503 HIGH

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

Vendor Microsoft
Product kiota-java
Weakness CWE-601 · Open redirect
Published May 14, 2026
Last update May 14, 2026
View on NVD All CVEs

CVSS base score

7.0/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 14, 2026 CVE published
May 14, 2026 Record updated