Medium severity6.5NVD Advisory· Published Sep 8, 2026· Updated Sep 17, 2026

CVE-2026-78520

Description

Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

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/Microsoft 365
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
Microsoft/Office8 versions
cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*+ 7 more
- cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
- cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
- cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
- cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
- cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*
- cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
- cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
- cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*
Microsoft/Word2 versions
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*+ 1 more
- cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
- cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*
Microsoft/Office Outlookllm-fuzzy