CVE-2026-44503 json
Kiota abstractions RedirectHandler leaks Cookie/Proxy-Authorization headers on cross-host redirect
published 2026-05-07 6 mo ago modified 2026-10-26 13 d ago also GHSA-7j59-v9qr-6fq9 , GO-2026-5224 , PYSEC-2026-2647 , EUVD-2026-30323
- cvss
- 7.0
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven com.microsoft.kiota:microsoft-kiota-abstractions 1.9.1
- nuget Microsoft.Kiota.Abstractions 1.22.0
- pypi microsoft-kiota-http 1.9.9
- npm kiota-typescript 1.0.0-preview.100
- go github.com/microsoft/kiota-http-go 1.5.5
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.64% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.0 | 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 |
| CNA | 4.0 | 7.0 | 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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | com.microsoft.kiota:microsoft-kiota-abstractions | <1.9.1 |
1.9.1 |
| nuget | Microsoft.Kiota.Abstractions | <1.22.0 |
1.22.0 |
| pypi | microsoft-kiota-http | <1.9.9 |
1.9.9 |
| npm | kiota-typescript | <1.0.0-preview.100 |
1.0.0-preview.100 |
| go | github.com/microsoft/kiota-http-go | <1.5.5 |
1.5.5 |
Affected products
- microsoft kiota-java
- microsoft Microsoft.Kiota.Abstractions
- microsoft github.com/microsoft/kiota-http-go
- microsoft kiota-typescript
- microsoft microsoft-kiota-abstractions
- microsoft microsoft-kiota-http
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/microsoft/kiota-java/security/advisories/GHSA-7j59-v9qr-6fq9
exploit, web, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-44503
advisory
-
github.com
/advisories/GHSA-7j59-v9qr-6fq9
advisory
-
github.com
/microsoft/kiota-java
package
-
github.com
/pypa/advisory-database/tree/main/vulns/microsoft-kiota-http/PYSEC-2026-2647.yaml
web
-
pypi.org
/project/microsoft-kiota-http
web, package
Sources
- CVE List CVE-2026-44503
- GitHub Advisory GHSA-7j59-v9qr-6fq9
- NVD CVE-2026-44503
- OSV PYSEC-2026-2647
- OSV GO-2026-5224
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.