CVE-2021-29961

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 89

Description The issue is related to the rendering of an oversized <select> element, where incorrect clipping allowed an attacker to paint over the user interface. This can potentially enable a remote attacker to modify the user interface.

Recommendations For versions prior to 89, update to version 89 or later to resolve the issue. As a temporary workaround, consider restricting the rendering of oversized <select> elements to minimize the risk of exploitation.