CVE-2026-55022 is a Microsoft Office type confusion vulnerability that can lead to remote code execution. Microsoft rates it as High severity with a CVSS v3.1 base score of 7.8 and temporal score of 6.8. The vector is local attack vector (AV:L), low attack complexity, no privileges required, and user interaction required; Microsoft says an attacker must send a malicious Office file and convince a user to open it, and the Preview Pane is also an attack vector. Microsoft reports no public disclosure and no known exploitation, with exploit code maturity listed as UNPROVEN. Because the attack requires local user interaction rather than direct network exposure, enterprise risk is lower than for network-based, unauthenticated issues, but it remains relevant for users handling untrusted Office documents.

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: Latest Software Release: Exploitation Less Likely; vector context is LOCAL with LOW attack complexity, NO privileges required, and user interaction required
- Severity for enterprise: High severity by CVSS, but real-world exposure is reduced by the local attack vector and required user interaction; phishing-style delivery via malicious Office files and Preview Pane use increases relevance for end-user environments
- Patch status: available; customer action required

Affected systems:
- No affected products listed in the provided product_tree