Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26973 Reference (s):
- https://bugzilla.mozilla.org/show_bug.cgi?id=1680084
- URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1680084
- https://www.mozilla.org/security/advisories/mfsa2020-54/
- URL: https://www.mozilla.org/security/advisories/mfsa2020-54/
- https://www.mozilla.org/security/advisories/mfsa2020-55/