The vulnerability in web browsers Firefox, Firefox ESR, and the email client Thunderbird, related to the lack of measures to protect the structure of web pages, allows attackers to execute cross-site scripting attacks.

The vulnerability in web browsers Firefox, Firefox ESR, and the email client Thunderbird relates to certain elements that may contain parentheses. Through these elements, it is possible to inject closing tags. Exploiting this vulnerability allows a remote attacker to perform cross-site scripting...