CVE-2026-50363 is a Windows Push Notifications elevation of privilege vulnerability caused by a heap-based buffer overflow. Microsoft rates it CVSS v3.1 7.8 (HIGH) with a temporal score of 6.8; the vector is LOCAL, LOW attack complexity, LOW privileges required, and NO user interaction. If successfully exploited, an attacker could gain SYSTEM privileges. Microsoft reports no public disclosure and no known exploitation, with exploit code maturity listed as UNPROVEN. Because this is a local privilege escalation issue, it is less relevant to internet-facing services than remote vulnerabilities, but it is still important for systems where attackers can obtain local code execution or low-privilege access.

Highlights:
- CVSS scores: Base 7.8 - Temporal 6.8
- Exploit status & code maturity: Publicly Disclosed: No; Exploited: No; Exploit Code Maturity: UNPROVEN.
- Impact: Elevation of Privilege; confidentiality, integrity, and availability impacts are all HIGH; successful exploitation could grant SYSTEM privileges.
- Exploitation likelihood: Exploitation Less Likely; local vector with LOW attack complexity, LOW privileges required, and NO user interaction.
- Severity for enterprise: High severity by CVSS, but enterprise risk is mainly on hosts where untrusted local users, local code execution, or shared access is possible; it is not a network-exposed attack.
- Patch status: available; customer action is required.

Affected systems:
- Windows 10 1607
- Windows 10 1809
- Windows 10 21H2
- Windows 10 22H2
- Windows 11 24H2
- Windows 11 25H2
- Windows 11 26H1
- Windows 11 unspecified
- Windows Server 2012 R2
- Windows Server 2016
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025