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CVE-2026-61355 Microsoft CVE debrief

A heap-based buffer overflow in the Windows Sensor Data Service allows an authorized attacker to elevate privileges locally. This vulnerability affects multiple Windows versions and requires immediate attention from system administrators and security teams. The vulnerability has been documented by the CVE Program and NVD, and Microsoft has released a patch for this issue. System administrators and security teams should assess exposure, apply patches, and monitor for potential exploitation attempts. Evidence is based on official CVE and NVD records, as well as Microsoft's security patch information. Affected versions include Windows 10 Version 21H2, Windows 10 Version 22H2, Windows

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-10-08
Advisory published
2026-08-11
Advisory updated
2026-10-08

Who should care

System administrators and security teams responsible for Windows systems, especially those with local access to affected versions, should assess exposure and apply patches or mitigations as needed.

Why it matters

CVE-2026-61355 is a high-severity vulnerability in the Windows Sensor Data Service that allows local privilege escalation. System administrators and security teams should assess exposure, apply patches, and monitor for potential exploitation attempts. Evidence is based on official CVE and NVD records, as well as Microsoft's security patch information.

  • Local privilege escalation requires verification from official sources
  • Affected versions and remediation status require verification from official sources
  • Inventory checks for affected Windows versions are necessary
  • Monitoring for local privilege escalation attempts is recommended

Technical summary

The Windows Sensor Data Service is vulnerable to a heap-based buffer overflow, allowing an authorized attacker to elevate privileges locally. Affected versions include 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 Server 2022, Windows Server 2025, and Windows Server 2025 (Server Core installation).

Defensive priority

High

Recommended defensive actions

  • Apply patches from Microsoft for affected Windows versions
  • Verify and update inventory of Windows systems
  • Monitor for local privilege escalation attempts

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue. The vulnerability affects multiple Windows versions, including 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 Server 2022, Windows Server 2025, and Windows Server 2025 (Server Core installation). System administrators and security

Sources and references

Verified primary and authoritative sources

  • CVE-2026-61355 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-61355

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

  • CVE-2026-61355 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-61355

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

Supplemental references

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.