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CVE-2026-50646 high CVSS 7.8

Unsafe Deserialization in Microsoft.WindowsDesktop.App.Runtime.win-x64 (CVE-2026-50646)

Summary

Vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-x64 (CVE-2026-50646). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 8.0.29 or later.

Original description

The description as published by the source.

Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.

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-2026-50646 has been found in Microsoft.WindowsDesktop.App.Runtime.win-x64.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade Microsoft.WindowsDesktop.App.Runtime.win-x64 to 8.0.29 or later.
If unsure, ask your IT team or search "Microsoft.WindowsDesktop.App.Runtime.win-x64 CVE-2026-50646" on the vendor's site.

CVE-2026-50646 (Microsoft.WindowsDesktop.App.Runtime.win-x64) — CWE-502 / CVSS v3 7.8
Attack vector: local / unauthenticated
Patched: 8.0.29 — 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

Unsafe deserialization (CWE-502) exists in Microsoft.WindowsDesktop.App.Runtime.win-x64.

📍 Affected scope

Check the vendor advisory for the affected versions of Microsoft.WindowsDesktop.App.Runtime.win-x64.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 8.0.29.

🛡️ 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 'Microsoft.WindowsDesktop.App.Runtime.win-x64' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'Microsoft.WindowsDesktop.App.Runtime.win-x64' . | 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 Microsoft.WindowsDesktop.App.Runtime.win-x64 を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade Microsoft.WindowsDesktop.App.Runtime.win-x64 to 8.0.29

    ステージング環境で 8.0.29 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。

  3. 3
    Post-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

nuget Microsoft.WindowsDesktop.App.Runtime.win-x64
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.29"}]}]
nuget Microsoft.WindowsDesktop.App.Runtime.win-x86
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.29"}]}]
nuget Microsoft.WindowsDesktop.App.Runtime.win-arm64
[{"type":"ECOSYSTEM","events":[{"introduced":"8.0.0"},{"fixed":"8.0.29"}]}]
Bitnami dotnet
[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.0.29"},{"introduced":"9.0.0"},{"fixed":"9.0.18"}]}]
Bitnami dotnet-sdk
[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.0.29"},{"introduced":"9.0.0"},{"fixed":"9.0.18"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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