In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.Referenceshttps://bugzilla.mozilla.org/show_bug.cgi?id=1666300https://www.mozilla.org/security/advisories/mfsa2020-50/https://www.mozilla.org/security/advisories/mfsa2020-52/https://www.mozilla.org/security/advisories/mfsa2020-51/
