CVE-2026-50435 - Windows Overlay Filter Elevation of Privilege Vulnerability - is a local Windows buffer over-read issue that can lead to elevation of privilege. Microsoft lists CVSS v3.1 base score 7.8 and temporal score 6.8, with a LOCAL attack vector, LOW attack complexity, LOW privileges required, and NO user interaction. The impact is high across confidentiality, integrity, and availability. Microsoft reports no public disclosure and no known exploitation, with exploit code maturity UNPROVEN. Because the attack requires local access, enterprise risk is primarily to systems where an attacker can obtain a foothold or local execution rather than to network-exposed services.

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.
- Exploitation likelihood: Exploitation Less Likely; LOCAL vector, LOW attack complexity, LOW privileges required, and NO user interaction.
- Severity for enterprise: High technical severity, but real-world exposure is lower than a network-based issue because exploitation is local-only. Risk is more relevant on systems where untrusted users or local code execution are possible.
- Patch status: available; customer action 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