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CVE-2026-42978 Microsoft CVE debrief

CVE-2026-42978 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 has a CVSS score of 7.8 and is classified as CWE-362 and CWE-416.

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 take necessary actions to mitigate it.

Technical summary

The vulnerability exists in the Windows Push Notifications component and allows an authorized attacker to elevate privileges locally due to improper synchronization of shared resources, also known as a race condition.

Defensive priority

High

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible
  • Review and update Windows Push Notifications configurations to ensure proper synchronization of shared resources

Evidence notes

The vulnerability was published on June 9, 2026, and modified on June 10, 2026. The CVSS vector is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42978 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42978

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

  • CVE-2026-42978 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42978

    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.