A bug in popup notifications’ interaction with WebAuthn made it easier for an attacker to trick a user into granting permissions. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.
bugzilla.mozilla.org/show_bug.cgi?id=1886082
lists.debian.org/debian-lts-announce/2024/05/msg00010.html
lists.debian.org/debian-lts-announce/2024/05/msg00012.html
www.mozilla.org/security/advisories/mfsa2024-21/
www.mozilla.org/security/advisories/mfsa2024-22/
www.mozilla.org/security/advisories/mfsa2024-23/