CVE-2026-50655 is a Microsoft Windows Media Foundation heap-based buffer overflow that can lead to Remote Code Execution. Microsoft rates it High severity with a CVSS v3.1 base score of 7.8 and temporal score of 6.8. The vector is local (AV:L), low attack complexity, no privileges required, user interaction required, and unchanged scope; CIA impact is high for confidentiality, integrity, and availability. Microsoft says the issue is not publicly disclosed, not exploited, exploit code maturity is unproven, and exploitation is more likely. Because it requires local attack conditions and user interaction, enterprise risk is higher for environments where users can be induced to open crafted content, rather than for 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: Remote Code Execution with HIGH confidentiality, integrity, and availability impacts.
- Exploitation likelihood: Exploitation More Likely; vector context is LOCAL with LOW attack complexity, NO privileges required, and USER INTERACTION REQUIRED.
- Severity for enterprise: High technical severity, but lower exposure than network-reachable bugs because exploitation is local and requires user interaction; phishing or social-engineering delivery is relevant based on the user-interaction requirement.
- Patch status: available

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 2016
- Windows Server 2019
- Windows Server 2022
- Windows Server 2025