CVE-2021-38505

Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard
which, if enabled, will record data copied to the clipboard to the cloud,
and make it available on other computers in certain scenarios. Applications
that wish to prevent copied data from being recorded in Cloud History must
use specific clipboard formats; and Firefox before versions 94 and ESR 91.3
did not implement them. This could have caused sensitive data to be
recorded to a user’s Microsoft account. This bug only affects Firefox for
Windows 10+ with Cloud Clipboard enabled. Other operating systems are
unaffected.. This vulnerability affects Firefox < 94, Thunderbird < 91.3,
and Firefox ESR < 91.3.

Notes