CVE-2020-26951

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 83 Firefox ESR versions prior to 78.5 Thunderbird versions prior to 78.5

Description A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. This issue could be exploited by an attacker already capable of exploiting an XSS vulnerability in privileged internal pages to bypass the built-in sanitizer. The vulnerability is related to a lack of integrity checking, which could allow a remote attacker to conduct cross-site scripting (XSS) attacks.

Recommendations For Firefox versions prior to 83, update to version 83 or later to resolve the issue. For Firefox ESR versions prior to 78.5, update to version 78.5 or later to resolve the issue. For Thunderbird versions prior to 78.5, update to version 78.5 or later to resolve the issue.