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CVE-2026-44503
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.
AI summary snake-internal / snake-material-v2
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. CVSS score: ?/10.
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.
❓ What is the problem
**A vulnerability** (CWE-601) exists in com.microsoft.kiota:microsoft-kiota-abstractions. Attackers reach the vulnerable code path via `Authorization header` without authentication.
📍 Affected scope
com.microsoft.kiota:microsoft-kiota-abstractions — . Attack surface: Authorization header / Cookie header.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.9.1**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'com.microsoft.kiota:microsoft-kiota-abstractions' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'com.microsoft.kiota:microsoft-kiota-abstractions' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `com.microsoft.kiota:microsoft-kiota-abstractions` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
maven
com.microsoft.kiota:microsoft-kiota-abstractions
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.1"}]}]
nuget
Microsoft.Kiota.Abstractions
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.22.0"}]}]
pip
microsoft-kiota-http
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.9"}]}]
npm
kiota-typescript
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.0.0-preview.100"}]}]
go
github.com/microsoft/kiota-http-go
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.5.5"}]}]
PyPI
microsoft-kiota-http
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.9"}]}]