Microsoft Outlook to block MSIX attachments starting November
Microsoft will block MSIX and MSIXBUNDLE attachments in Outlook starting November, closing an initial-access vector already weaponised in multiple malware campaigns — teams should pre-emptively enforce the same block today.
Summary written by editorial AI · Source link below
Microsoft announced that it will add .msix and .msixbundle attachments to the list of blocked attachments in Outlook Web and the new Outlook Windows client starting next month. [...]
Editorial Analysis
MSIX files have been abused as signed-looking installers to deliver malware; proactive blocking closes a known gap before Microsoft's scheduled enforcement date.
Add MSIX and MSIXBUNDLE to your email gateway block list immediately rather than waiting for Microsoft's November rollout.
Forward-looking interpretation drafted by editorial AI under human review — not a reproduction of the source. See methodology.
External link — opens at BleepingComputer in a new tab.
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