By using XSL Transforms, a malicious webserver could have served a user an XSL document that would continue to execute JavaScript (within the bounds of the same-origin policy) even after the tab was closed. This vulnerability affects Firefox < 97.
https://www.mozilla.org/security/advisories/mfsa2022-04/
https://bugzilla.mozilla.org/show_bug.cgi?id=1309630
Source: Mitre, NVD
Published: 2022-12-22
Updated: 2022-12-29
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
Severity: Critical
Base Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Severity: High