CVE-2026-44503
Published:May 14, 2026
Updated:May 18, 2026
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.
Affected Packages
github.com/microsoft/kiota-http-go (GO):
Affected version(s) >=v0.1.0 <v1.5.5Fix Suggestion:
Update to version v1.5.5com.microsoft.kiota:microsoft-kiota-abstractions (JAVA):
Affected version(s) >=0.1.2 <1.9.1Fix Suggestion:
Update to version 1.9.1microsoft.kiota.abstractions (NUGET):
Affected version(s) >=1.0.0-rc.1 <1.22.0Fix Suggestion:
Update to version 1.22.0microsoft-kiota-http (PYTHON):
Affected version(s) >=0.1.0 <1.9.9Fix Suggestion:
Update to version 1.9.9Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
URL Redirection to Untrusted Site ('Open Redirect')
EPSS
Base Score:
0.06