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CVE-2026-42979 Microsoft CVE debrief

CVE-2026-42979 is a HIGH-severity vulnerability in Windows Push Notifications that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and was published on 2026-06-09T17:17:13.697Z. The vulnerability was modified on 2026-06-11T17:00:05.750Z.

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
2026-06-11
Advisory published
2026-06-09
Advisory updated
2026-06-11

Who should care

Administrators and users of Microsoft 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 is caused by a race condition in Windows Push Notifications, which allows an authorized attacker to elevate privileges locally. The vulnerability affects multiple versions of Microsoft Windows 10, Windows 11, and Windows Server.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches and updates from Microsoft as soon as possible.
  • Ensure that Windows Push Notifications are properly configured and secured.
  • Monitor system logs for suspicious activity.

Evidence notes

The vulnerability is documented in the CVE record [cve-org]. Details can be found in the NVD vulnerability detail page [nvd]. Microsoft has provided a vendor advisory [ref-4] for this vulnerability.

Official resources

CVE-2026-42979 was published on 2026-06-09T17:17:13.697Z and modified on 2026-06-11T17:00:05.750Z.