Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.CreditsMozillaReferenceshttps://bugzilla.mozilla.org/show_bug.cgi?id=2061387https://www.mozilla.org/security/advisories/mfsa2026-90/https://www.mozilla.org/security/advisories/mfsa2026-94/
