WebExtensions could use popups and panels in the extension UI to load an "about:" privileged URL, violating security checks that disallow this behavior. This vulnerability affects Firefox < 56.
WebExtensions podría utilizar las ventanas emergentes y los paneles en la interfaz de usuario de la extensión para cargar una URL privilegiada "about:", violando las comprobaciones de seguridad que no permiten este comportamiento. Esta vulnerabilidad afecta a las versiones anteriores a la 56 de Firefox.
Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to read uninitialized memory, obtain sensitive information, bypass phishing and malware protection, spoof the origin in modal dialogs, conduct cross-site scripting attacks, cause a denial of service via application crash, or execute arbitrary code. Various other issues were also addressed.
