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.
<p>An elevation of privilege vulnerability exists when the Windows Backup Service improperly handles file operations.</p>
<p>To exploit this vulnerability, an attacker would first have to gain execution on the victim system. An attacker could then run a specially crafted application to elevate privileges.</p>
<p>The security update addresses the vulnerability by correcting how the Windows Backup Service handles file operations.</p>
<p>A remote code execution vulnerability exists in the way that Microsoft Windows Codecs Library handles objects in memory. An attacker who successfully exploited the vulnerability could execute arbitrary code.</p>
<p>Exploitation of the vulnerability requires that a program process a specially crafted image file.</p>
<p>The update addresses the vulnerability by correcting how Microsoft Windows Codecs Library handles objects in memory.</p>