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PatchSiren cyber security CVE debrief

CVE-2026-26167 Microsoft CVE debrief

A Windows Push Notifications Elevation of Privilege Vulnerability exists due to a race condition in Windows Push Notifications, allowing an authorized attacker to elevate privileges locally. Multiple Windows versions and editions are affected, including Windows 10, Windows 11, and Windows Server. This vulnerability is particularly concerning as it can be exploited locally, potentially allowing attackers to gain elevated access to sensitive systems and data. Defenders responsible for Windows systems, particularly those with Windows Push Notifications enabled, should assess exposure and prioritize patching. The vulnerability's impact is heightened by its potential for local privilege

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows systems, particularly those with Windows Push Notifications enabled, should assess exposure and prioritize patching.

Why it matters

CVE-2026-26167 allows local privilege escalation through a race condition in Windows Push Notifications. Defenders should prioritize patching affected systems.

  • Local privilege escalation is possible, allowing attackers to gain elevated access.
  • Systems with Windows Push Notifications enabled are at risk of exploitation.
  • Patching is required to prevent exploitation.
  • Verification of affected systems and deployment of patches is necessary.

Technical summary

The vulnerability exists due to a race condition in Windows Push Notifications. An authorized attacker can exploit this vulnerability to elevate privileges locally. The vulnerability affects multiple Windows versions and editions, including Windows 10, Windows 11, and Windows Server. The technical details of the vulnerability involve a flaw in the synchronization of shared resources, allowing for a race condition that can be exploited for local privilege escalation. Defenders should prioritize patching this vulnerability, as it allows for local privilege

Defensive priority

Defenders should prioritize patching this vulnerability, as it allows for local privilege escalation. Systems with Windows Push Notifications enabled are at risk.

Recommended defensive actions

  • Apply patches from Microsoft for the affected Windows versions and editions.
  • Ensure Windows Push Notifications are properly configured and monitored.
  • Conduct regular vulnerability assessments and penetration testing to identify potential weaknesses.

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue. The vulnerability has been publicly disclosed and is considered high-severity, with a CVSS score of 8.8. There is no evidence of widespread exploitation, but defenders should verify affected systems and deploy patches to prevent potential exploitation. The CVE record was published on 2026-04-14T16:57:04.120Z and has not been modified since then. Additional details can

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26167 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26167

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

  • CVE-2026-26167 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26167

    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.