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CVE-2026-62902 medium CVSS 6.5

Vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (CVE-2026-62902)

Summary

Vulnerability in Microsoft.WindowsDesktop.App.Runtime.win-arm64 (CVE-2026-62902). Confidential information can be exposed externally. Mitigation: upgrade to 8.0.30 or later.

Original description

The description as published by the source.

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in Windows Presentation Foundation. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A specially crafted document parsed in .NET can trigger the inclusion of functionality from an untrusted control sphere, allowing an unauthorized attacker to disclose information over a network.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/433

CVSS Details

  • Version: 3.1
  • Severity: Medium
  • Score: 6.5
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
  • Weakness: CWE-829: Inclusion of Functionality from Untrusted Control Sphere; CWE-693: Protection Mechanism Failure; CWE-918: Server-Side Request Forgery (SSRF)

Affected Platforms

  • Platforms: Windows
  • Architectures: All

Affected Packages

The vulnerability affects any Microsoft .NET project if it uses any of affected package versions listed below

.NET 10

Package name Affected version Patched version
Microsoft.WindowsDesktop.App.Runtime.win-arm64 >= 10.0.0, <= 10.0.10 10.0.11
[Microsoft.WindowsDesktop.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.WindowsDesktop.App.Runt…

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-2026-62902 has been found in Microsoft.WindowsDesktop.App.Runtime.win-arm64.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade Microsoft.WindowsDesktop.App.Runtime.win-arm64 to 8.0.30 or later.
If unsure, ask your IT team or search "Microsoft.WindowsDesktop.App.Runtime.win-arm64 CVE-2026-62902" on the vendor's site.

CVE-2026-62902 (Microsoft.WindowsDesktop.App.Runtime.win-arm64) — CWE-693 / CVSS v3 6.5
Attack vector: remote (network-reachable) / unauthenticated
Patched: 8.0.30 — 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-693) exists in Microsoft.WindowsDesktop.App.Runtime.win-arm64.

📍 Affected scope

Check the vendor advisory for the affected versions of Microsoft.WindowsDesktop.App.Runtime.win-arm64.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 8.0.30.

🛡️ 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-arm64' . 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-arm64' . | 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-arm64 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-arm64 to 8.0.30

    ステージング環境で 8.0.30 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-arm64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.30"}]}]
nuget Microsoft.WindowsDesktop.App.Runtime.win-x64
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.30"}]}]
nuget Microsoft.WindowsDesktop.App.Runtime.win-x86
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.30"}]}]

References

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