Open Redirect in com.microsoft.kiota:microsoft-kiota-abstractions (CVE-2026-44503)
Summary
Vulnerability in com.microsoft.kiota:microsoft-kiota-abstractions (CVE-2026-44503). Risk of unauthorized operations or information disclosure. Exploitable via Authorization header. Mitigation: upgrade to 1.9.1 or later.
Original description
The description as published by the source.
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: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-44503 has been found in com.microsoft.kiota:microsoft-kiota-abstractions.
Attackers can target a specific entry point like Authorization header over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade com.microsoft.kiota:microsoft-kiota-abstractions to 1.9.1 or later.
If unsure, ask your IT team or search "com.microsoft.kiota:microsoft-kiota-abstractions CVE-2026-44503" on the vendor's site.
CVE-2026-44503 (com.microsoft.kiota:microsoft-kiota-abstractions) — CWE-601
Attack surface: Authorization header / Cookie header
Patched: 1.9.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-601) exists in com.microsoft.kiota:microsoft-kiota-abstractions. Attackers reach the vulnerable code path via Authorization header.
Check the vendor advisory for the affected versions of com.microsoft.kiota:microsoft-kiota-abstractions. Attack surface: Authorization header / Cookie header.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.9.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで com.microsoft.kiota:microsoft-kiota-abstractions を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade com.microsoft.kiota:microsoft-kiota-abstractions to 1.9.1ステージング環境で 1.9.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- web github.com
- web github.com
- web github.com
- web pypi.org