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CVE-2026-42977 Microsoft CVE debrief

CVE-2026-42977 is a high-severity elevation of privilege vulnerability in Windows Push Notifications. An authorized attacker could exploit this vulnerability to elevate privileges locally. The vulnerability is caused by a concurrent execution using shared resource with improper synchronization, also known as a race condition.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-10
Advisory published
2026-06-09
Advisory updated
2026-06-10

Who should care

Administrators and users of Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability and apply patches as available.

Technical summary

The vulnerability is caused by a concurrent execution using shared resource with improper synchronization, also known as a race condition, in Windows Push Notifications. This allows an authorized attacker to elevate privileges locally. The CVSS score for this vulnerability is 7.8, indicating a high severity.

Defensive priority

High

Recommended defensive actions

  • Apply patches as available from Microsoft.
  • Review and update Windows Push Notifications configurations to ensure proper synchronization.

Evidence notes

The CVE record and NVD detail pages provide additional information about this vulnerability, including affected products and CVSS vectors.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42977 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42977

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

  • CVE-2026-42977 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42977

    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.