CVE-2021-38655

What this means for your business

• It affects Microsoft 365 Apps. It matters if your company, or a supplier that handles your data, runs it.
• An attacker can use it only with access to the machine itself, without a login, but only after tricking someone into an action such as opening a file or a link.
• FIRST's prediction model gives it a 6% chance of attack attempts being seen in the next 30 days, ranking above 93% of all known flaws.

What to do

1. 1Check whether your company or your suppliers run Microsoft 365 Apps, and which version. The affected versions are listed further down this page.
2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.