CVE-2025-53726 Overview
CVE-2025-53726 is a type confusion vulnerability in the Windows Push Notifications component. An authorized local attacker can exploit the flaw to elevate privileges on affected systems. The issue is tracked under CWE-843 (Access of Resource Using Incompatible Type). Microsoft disclosed the vulnerability across supported Windows client and server releases, including Windows 10, Windows 11, and Windows Server 2012 through 2025. Successful exploitation grants attackers high impact on confidentiality, integrity, and availability of the target host. See the Microsoft Security Update for CVE-2025-53726 for vendor guidance.
Critical Impact
A local, authenticated attacker can elevate to SYSTEM-level privileges through type confusion in the Windows Push Notifications service, compromising the entire host.
Affected Products
- Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
- Microsoft Windows 11 (versions 22H2, 23H2, 24H2)
- Microsoft Windows Server 2012, 2016, 2019, 2022, 2022 23H2, and 2025
Discovery Timeline
- 2025-08-12 - CVE-2025-53726 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-53726
Vulnerability Analysis
The vulnerability resides in the Windows Push Notifications subsystem, which handles toast notifications and background delivery for applications. The service processes objects passed through inter-process communication interfaces. When it accesses one of these objects using an incompatible type, the mismatch produces undefined behavior that an attacker can steer toward controlled memory operations.
Because Windows Push Notifications runs with elevated privileges, code executed inside that context inherits those privileges. A standard user account is enough to reach the vulnerable code path, meaning the attacker does not need administrative rights before the exploit. The result is a full local privilege escalation with complete impact on confidentiality, integrity, and availability.
Root Cause
The defect is categorized as [CWE-843] type confusion. Code paths inside the notification service cast or interpret an object as one type after it was allocated or initialized as another. Missing runtime type validation allows attacker-controlled data to be treated as trusted structure fields, including pointers or function references consumed later by the service.
Attack Vector
Exploitation requires local access and a valid user session. The attacker interacts with the Push Notifications service through its exposed IPC surface, submits crafted objects, and triggers the confused type access. The vulnerability requires no user interaction beyond the attacker's own session. See the Microsoft Security Update for CVE-2025-53726 for vendor detail.
No public proof-of-concept code or exploit modules were available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2025-53726
Indicators of Compromise
- Unexpected child processes spawned by WpnUserService or WpnService running under elevated tokens.
- Crashes or repeated restarts of the Windows Push Notifications service recorded in the System event log.
- New scheduled tasks, services, or persistence artifacts created shortly after Push Notification service activity by a standard user.
Detection Strategies
- Hunt for token manipulation events where a low-privileged process suddenly performs actions with SYSTEM-level rights following interaction with Push Notification APIs.
- Monitor process lineage for anomalous parent-child relationships involving svchost.exe instances that host WpnUserService and WpnService.
- Correlate Windows Error Reporting entries for the notification service with subsequent privilege changes on the same host.
Monitoring Recommendations
- Enable Sysmon Event ID 1 (process creation) and Event ID 10 (process access) to capture handles opened against the Push Notifications service.
- Forward Windows Security, System, and Application logs to a centralized SIEM for correlation across endpoints.
- Baseline normal Push Notification service behavior so deviations trigger alerts.
How to Mitigate CVE-2025-53726
Immediate Actions Required
- Apply the August 2025 Microsoft security updates addressing CVE-2025-53726 to every supported Windows client and server listed in the advisory.
- Prioritize patching multi-user hosts such as terminal servers, developer workstations, and jump boxes where local attackers have footholds.
- Audit local user accounts and remove unused or overly permissive accounts that could stage local exploitation.
Patch Information
Microsoft released patches for all supported Windows client and Windows Server versions. Administrators should consult the Microsoft Security Update for CVE-2025-53726 for the specific KB article that matches each affected build and deploy through Windows Update, WSUS, or the enterprise patch management tool.
Workarounds
- No official workaround has been published by Microsoft; installing the security update is the supported remediation.
- Restrict interactive and remote logon rights so only trusted users can execute local code on sensitive systems.
- Enforce application allow-listing and least-privilege policies to reduce the pool of processes that can reach the vulnerable IPC endpoint.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
