Using object or embed tags, it was possible to frame other websites, even if they disallowed framing using the X-Frame-Options header. This vulnerability affects Thunderbird < 78 and Firefox < 78.0.2. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15648 Reference (s):
- https://bugzilla.mozilla.org/show_bug.cgi?id=1644076
- URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1644076
- https://www.mozilla.org/security/advisories/mfsa2020-28/
- URL: https://www.mozilla.org/security/advisories/mfsa2020-28/
- https://www.mozilla.org/security/advisories/mfsa2020-29/