The executable file warning was not presented when downloading .inetloc files, which, due to a flaw in Mac OS, can run commands on a user's computer.Note: This issue only affected Mac OS operating systems. Other operating systems are unaffected.. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-38510
• https://bugzilla.mozilla.org/show_bug.cgi?id=1731779
• https://www.mozilla.org/security/advisories/mfsa2021-48/
• https://www.mozilla.org/security/advisories/mfsa2021-49/
• https://www.mozilla.org/security/advisories/mfsa2021-50/