Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect
Published May 14, 2026
7.0
HIGHCVSS 4.0
EPSS 0.84%
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 products
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- Version < 1.22.0StatusaffectedConstraints-
- Version
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- Version < 1.5.5StatusaffectedConstraints-
- Version
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- Version < 1.9.1StatusaffectedConstraints-
- Version
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- Version < 1.0.0-preview.100StatusaffectedConstraints-
- Version
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- Version < 1.9.1StatusaffectedConstraints-
- Version
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- Version < 1.9.9StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft.Kiota.Abstractions | n/a |
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| Microsoft | Github.com/microsoft/kiota-Http-GO | n/a |
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| Microsoft | Kiota-Java | n/a |
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| Microsoft | Kiota-Typescript | n/a |
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| Microsoft | Microsoft-Kiota-Abstractions | n/a |
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| Microsoft | Microsoft-Kiota-Http | n/a |
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No data.
No data.
No Red Hat product state for this CVE.
github.com/microsoft/kiota-http-go
Go
Introduced 0 Fixed 1.5.5com.microsoft.kiota:microsoft-kiota-abstractions
Maven
Introduced 0 Fixed 1.9.1Microsoft.Kiota.Abstractions
NuGet
Introduced 0 Fixed 1.22.0microsoft-kiota-http
PyPI
Introduced 0 Fixed 1.9.9kiota-typescript
npm
Introduced 0 Fixed 1.0.0-preview.100
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/microsoft/kiota-http-go | 0 | 1.5.5 |
| Maven | com.microsoft.kiota:microsoft-kiota-abstractions | 0 | 1.9.1 |
| NuGet | Microsoft.Kiota.Abstractions | 0 | 1.22.0 |
| PyPI | microsoft-kiota-http | 0 | 1.9.9 |
| npm | kiota-typescript | 0 | 1.0.0-preview.100 |
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 14, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.84% (0.00837) | 56.23th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.51% (0.00505) | 38.91th | v5 (v2026.06.15) |
| May 15, 2026 | 0.06% (0.00061) | 19.14th | v4 (v2025.03.14) |
References (6)
- https://github.com/advisories/GHSA-7j59-v9qr-6fq9 Advisory
- https://github.com/microsoft/kiota-java
- https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9 exploitx_refsource_CONFIRM
- https://github.com/pypa/advisory-database/tree/main/vulns/microsoft-kiota-http/PYSEC-2026-2647.yaml
- https://nvd.nist.gov/vuln/detail/CVE-2026-44503
- https://pypi.org/project/microsoft-kiota-http
Change history (0)
No recorded changes yet.