Marco Bonardo

Name of the Vulnerable Software and Affected Versions: Firefox versions prior to 133 Firefox ESR versions prior to 128.5 Thunderbird versions prior to 133 Thunderbird versions prior to 128.5 Description: The issue is related to the lack of a warning when downloading .library-ms files, which could allow a remote attacker to conduct spoofing attacks using a specially crafted file. This problem only affects Windows operating systems. Recommendations: For Firefox versions prior to 133, update to version 133 or later to resolve the issue. For Firefox ESR versions prior to 128.5, update to version 128.5 or later to resolve the issue. For Thunderbird versions prior to 133, update to version 133 or later to resolve the issue. For Thunderbird versions prior to 128.5, update to version 128.5 or later to resolve the issue. As a temporary workaround, consider avoiding the download of .library-ms files until the issue is resolved.

**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 insufficient warning about potentially dangerous actions when downloading certain file types. Specifically, the executable file warning was not presented when downloading files with .msix, .msixbundle, .appx, and .appxbundle extensions, which can run commands on a user's computer. This issue only affects Windows 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 avoiding the download of .msix, .msixbundle, .appx, and .appxbundle files until the issue is resolved.