CVE-2026-50363: Microsoft Windows Push Notifications heap overflow privilege escalation

CVE-2026-50363 · Severity: high · CVSS 7.8 · Published 2026-07-14

A security vulnerability has been identified in the Windows Push Notification service, which handles real-time alerts and updates for applications. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to access sensitive data, install malicious software, or disrupt business operations.

Technologies: Microsoft Windows 11, Microsoft Windows Server 2012 R2, Microsoft Windows 10. Vendors: Microsoft.

Quick answers

Is CVE-2026-50363 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-50363 being exploited in the wild.
How severe is CVE-2026-50363?
High severity, with a CVSS score of 7.8, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 10.0.26100.0 to 10.0.26100.8875; Microsoft Windows Server 2012 R2 6.3.9600.0 to 6.3.9600.23291; Microsoft Windows 10 10.0.14393.0 to 10.0.14393.9339.
Is there a fix for CVE-2026-50363?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-50363 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2026-50363?
Check whether you run Microsoft Windows 11, Microsoft Windows Server 2012 R2 or Microsoft Windows 10 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow vulnerability (CWE-122) exists in the Windows Push Notification service. The flaw is triggered when the service improperly handles memory allocation during the processing of notification data. An attacker with low-privileged local access can exploit this by running a specially crafted application to overwrite memory, leading to local privilege escalation (LPE) to SYSTEM level. The attack requires no user interaction. Microsoft has released security updates to address this issue across affected Windows 10, Windows 11, and Windows Server versions.

Affected products

  • Microsoft Windows 10 Version 1607 10.0.14393.0 to 10.0.14393.9339
  • Microsoft Windows 10 Version 1809 10.0.17763.0 to 10.0.17763.9020
  • Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
  • Microsoft Windows 10 Version 22H2 10.0.19045.0 to 10.0.19045.7548
  • Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
  • Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26200.8875
  • Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2269
  • Microsoft Windows Server 2012 R2 6.3.9600.0 to 6.3.9600.23291

Timeline

  • 2026-07-14: disclosed
  • 2026-07-14: advisory

References

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