CVE-2026-54114 is a Windows Win32k use-after-free vulnerability that can be used for elevation of privilege. Microsoft rates it at CVSS v3.1 7.8 (High) with a temporal score of 6.8; the vector is local attack, low attack complexity, low privileges required, and no user interaction. The impact is high across confidentiality, integrity, and availability. Microsoft has not reported public disclosure or exploitation, but it notes exploitation is more likely. Because this is a local privilege escalation issue, enterprise risk is primarily on systems where untrusted local code or users can run.

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 with HIGH confidentiality, integrity, and availability impacts.
- Exploitation likelihood: Exploitation More Likely; local vector, LOW attack complexity, LOW privileges required, and NO user interaction.
- Severity for enterprise: High technical severity, but risk is mainly for endpoints and servers where local execution by an attacker is possible; it is not a network-exposed, no-interaction attack path.
- Patch status: available

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