CVE-2016-9073

CVE-2016-9073 describes a vulnerability in Firefox versions prior to 50, where WebExtensions could bypass security checks to load privileged URLs, potentially escaping their sandbox. This high-severity flaw (CVSS 7.5) has a network attack vector and high impact on integrity, though no impact on confidentiality or availability. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability did receive some community discussion and media coverage at the time of its disclosure.