CVE-2026-44503

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

HIGH

CVSS Score

Published: May 14, 2026 at 03:58 PM UTC

Updated: October 26, 2026 at 02:10 PM UTC

2 products affected across 1 vendormicrosoft-kiota-abstractionsKiota

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Severity

HIGH7

Exploit prediction

EPSS 0.6%

SSVC

PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

microsoft-kiota-abstractions · Microsoft

96%

v < 1.9.1

Kiota · Microsoft

90%

v < 1.0.0-preview.100v < 1.22.0v < 1.5.5v < 1.9.1v < 1.9.9

Affected range stops below 1.0.0-preview.100, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.22.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.5.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.9.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.9.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM

Source: cverecord

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

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHGitHub_M

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-601

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