Local privilege escalation via notification resource race
Published Jun 9, 2026 · Updated Jun 9, 2026
Use-after-free in Windows Push Notifications allows local users with low privileges to elevate privileges on affected Windows systems. PresentationEndpointFacade methods in wpncore.dll use a NotificationPlatform pointer during shutdown without holding the shared lock or checking the shutdown flag, so the shutdown thread can free the object first. Exploitation requires local authorized access and winning a high-complexity race; success grants SYSTEM-level code execution.
Summary
What happened
Use-after-free in Windows Push Notifications allows local users with low privileges to elevate privileges on affected Windows systems. PresentationEndpointFacade methods in wpncore.dll use a NotificationPlatform pointer during shutdown without holding the shared lock or checking the shutdown flag, so the shutdown thread can free the object first. Exploitation requires local authorized access and winning a high-complexity race; success grants SYSTEM-level code execution.
The record
- CVE
- CVE-2026-42978
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-416, CWE-362, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.8880
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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