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CVE-2026-88093 Microsoft CVE debrief

A heap-based buffer overflow in the Desktop Window Manager allows an authorized attacker to elevate privileges locally. Multiple Windows versions are affected, including Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for this vulnerability. The vulnerability affects various Windows versions, including Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H2, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2025, and Windows Server 2025

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-14
Advisory published
2026-10-13
Advisory updated
2026-10-14

Who should care

System administrators and security teams responsible for Windows systems, especially those with high-risk exposure or elevated privileges, should prioritize patching.

Why it matters

This vulnerability allows authorized attackers to elevate privileges locally, posing a significant risk to Windows systems. Immediate patching is recommended, especially for high-risk systems.

  • Elevation of privileges for attackers with local access.
  • Potential for lateral movement within compromised systems.
  • Need for patch verification and system integrity checks.

Technical summary

The Desktop Window Manager is vulnerable to a heap-based buffer overflow, allowing an authorized attacker to elevate privileges locally. This issue affects multiple Windows versions, including Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H2, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2025, and Windows Server 2025 (Server Core installation).

Defensive priority

Apply patches immediately for affected Windows versions, especially on systems with high-risk exposure.

Recommended defensive actions

  • Apply patches for affected Windows 10, Windows 11, and Windows Server versions.
  • Prioritize patching on systems with high-risk exposure or elevated privileges.
  • Verify patch application and system integrity.

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft's advisory confirms the issue and provides patches. The vulnerability has been publicly disclosed and is currently unconfirmed by NVD. There are no known exploits in the wild, but immediate patching is recommended, especially for high-risk systems. The CVE record was published on 2026-10-13T19:01:11.554Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-88093 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-88093

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-88093 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-88093

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Desktop Window Manager Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/88xxx/CVE-2026-88093.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88093

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.