Advisories
Microsoft issues Office for Mac update for Excel information disclosure CVE-2026-81393
Microsoft released a security update for Microsoft Office for Mac to address CVE-2026-81393, an information disclosure vulnerability in Microsoft Excel. The advisory directs customers running affected Mac Office products to install the update, while other Microsoft Office software is not called out for action. Defenders should prioritize Mac endpoint patching and verify deployment.
What happened
Microsoft published a security update for Microsoft Office for Mac to remediate CVE-2026-81393, described as a Microsoft Excel information disclosure vulnerability. The advisory does not provide additional technical details, such as affected versions, severity, attack vector, or public exploit status.
Who is affected
Microsoft says customers running affected Microsoft Office for Mac software should install the update for their product. Customers running other Microsoft Office software are told they do not need to take action.
What to do
- Inventory Mac endpoints running Microsoft Office and identify Excel installations.
- Deploy the Office for Mac security update through your patching system.
- Verify that the update is installed and current on affected Macs.
- Review internal risk posture for Excel document handling, especially if Mac users open untrusted Office files.
Defensive notes
Because the advisory is limited to an Office for Mac update and an Excel information disclosure issue, treat this as a patch-management action unless additional vendor guidance or threat intelligence indicates a more urgent exposure. Track the CVE in your vulnerability management system and confirm closure after deployment.
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