The vulnerability in Mozilla Firefox, Firefox ESR, and the email client Thunderbird arises from incorrect encoding or the concealment of output data, allowing attackers to perform cross-site scripting (XSS) attacks.

The vulnerabilities of Mozilla Firefox, Firefox ESR, and the email client Thunderbird are related to improper encoding or the concealment of output data. Exploiting these vulnerabilities allows a remote attacker to perform cross-site scripting attacks XSS...