CVE-2022-45414

The Mozilla Foundation Security Advisory describes this flaw as: If a Thunderbird user quoted from an HTML email and the email contained either a video tag with the poster attribute or an object tag with a data attribute, a network request to the referenced remote URL was performed regardless of a configuration to block remote content, and an image loaded from the poster attribute was shown in the composer window. These issues could have given an attacker additional capabilities when targeting releases that did not yet have a fix for CVE-2022-3033.

Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, bypass security restrictions, cross-site tracing, or execute arbitrary code.