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

Quick assessment

Affected
microsoft kiota-java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kiota Java Libraries是Microsoft开源的一个用于生成OpenAPI SDK的Java基础库集合。 Kiota Java Libraries 1.9.0版本存在输入验证错误漏洞，该漏洞源于RedirectHandler中间件在遵循3xx重定向到不同主机或方案时未能剥离敏感HTTP头，仅移除Authorization头，Cookie、Proxy-Authorization和所有自定义头被转发到重定向目标。

AI Predicted 7.4 Difficulty: Easy EPSS 0.84% · P56

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 6

VendorProduct Version RangeStatus
microsoft github.com/microsoft/kiota-http-go < 1.5.5 affected
microsoft kiota-java < 1.9.1 affected
microsoft kiota-typescript < 1.0.0-preview.100 affected
microsoft microsoft-kiota-abstractions < 1.9.1 affected
microsoft microsoft-kiota-http < 1.9.9 affected
microsoft Microsoft.Kiota.Abstractions < 1.22.0 affected
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I. Basic Information for CVE-2026-44503

Vulnerability Information
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Vulnerability Title
Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Kiota Java Libraries 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kiota Java Libraries是Microsoft开源的一个用于生成OpenAPI SDK的Java基础库集合。 Kiota Java Libraries 1.9.0版本存在输入验证错误漏洞，该漏洞源于RedirectHandler中间件在遵循3xx重定向到不同主机或方案时未能剥离敏感HTTP头，仅移除Authorization头，Cookie、Proxy-Authorization和所有自定义头被转发到重定向目标。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
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 -

II. Public POCs for CVE-2026-44503

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III. Intelligence Information for CVE-2026-44503

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Vendor Advisories for CVE-2026-44503 (1)

Same Patch Batch · microsoft · 2026-05-14 · 3 CVEs total

CVE-2026-41615 9.6 CRITICAL Microsoft Authenticator Information Disclosure Vulnerability
CVE-2026-42897 8.1 HIGH Microsoft Exchange Server Spoofing Vulnerability

IV. Related Vulnerabilities

Same vendor: microsoft
Same weakness: CWE-601

V. Comments for CVE-2026-44503

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