CVE-2026-50351 is a Windows Audio Compression Manager (ACM) elevation of privilege vulnerability caused by improper access control. Microsoft rates it with a CVSS v3.1 base score of 7.8 and a temporal score of 6.8. The attack vector is LOCAL, with LOW attack complexity, LOW privileges required, and no user interaction. The impact is high for confidentiality, integrity, and availability. Microsoft lists exploit status as not publicly disclosed and not exploited, but also says exploitation is more likely. This is a local privilege escalation issue, so enterprise risk is highest where untrusted local users or code can run on affected systems.

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, HIGH integrity, and HIGH availability impacts
- Exploitation likelihood: Exploitation More Likely; LOCAL vector with LOW attack complexity, LOW privileges required, and NO user interaction
- Severity for enterprise: High technical severity, but risk is limited to local attack paths rather than network-exposed services; priority is higher on systems where local code execution or untrusted users 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
- Windows Server 2012 R2
- Windows Server 2016
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025