Mozilla · Thunderbird · CVE-2023-5726
**Name of the Vulnerable Software and Affected Versions**
Firefox versions prior to 119
Firefox ESR versions prior to 115.4
Thunderbird versions prior to 115.4.1
**Description**
The issue is related to errors in presenting information to the user interface, resulting in the hiding of full-screen notifications. This could lead to user confusion and possible spoofing attacks. A website could obscure the full-screen notification by using the file open dialog. This issue only affects macOS operating systems, with other operating systems being unaffected.
**Recommendations**
For Firefox versions prior to 119, update to version 119 or later to resolve the issue.
For Firefox ESR versions prior to 115.4, update to version 115.4 or later to resolve the issue.
For Thunderbird versions prior to 115.4.1, update to version 115.4.1 or later to resolve the issue.
As a temporary workaround, consider restricting the use of the file open dialog in affected versions to minimize the risk of exploitation.