High severity8.8NVD Advisory· Published May 12, 2026· Updated Jun 1, 2026

CVE-2026-40420

Description

Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.

Microsoft/365 Apps2 versions
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*+ 1 more
- cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
- cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
Microsoft/Office3 versions
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*+ 2 more
- cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*
- cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*
- (no CPE)
Microsoft/Office Long Term Servicing Channel4 versions
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*+ 3 more
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*