CVE-2026-57963

A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: An attacker who can send HTML chat messages via Matrix or XMPP can inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI...

CVE-2026-57963

An attacker who can send HTML chat messages via Matrix or XMPP can inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1...