CVE-2026-55133HighCVSS 7.8
Microsoft OneNote Remote Code Execution Vulnerability
🔗 CVE IDs covered (1)
📋 Description
Heap-based buffer overflow in Microsoft Office OneNote allows an unauthorized attacker to execute code locally.
🎯 Affected products5
- Microsoft 365 Apps for Enterprise for 32-bit Systems
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft Office 365 for Mac
- Microsoft Office LTSC for Mac 2021
- Microsoft Office LTSC for Mac 2024
✅ Remediation
KBClick to Run (Security Update) — fixed build https://aka.ms/OfficeSecurityReleases KBRelease Notes (Security Update) — fixed build 16.111.26071215
🔗 References (4)
- advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55133
- referencehttps://docs.microsoft.com/en-us/officeupdates/office365-proplus-security-updates
- patchhttps://www.microsoft.com/en-us/microsoft-365/mac/microsoft-365-for-mac?msockid=35f9adb0e74b61392038b90de6fe608c
- patchhttps://go.microsoft.com/fwlink/p/?linkid=831049