CVE-2020-15655

Una petición HTTP redireccionada que es observada o modificada por medio de una extensión web podría omitir las comprobaciones de CORS existentes, conllevando a una potencial divulgación de información de origen cruzado. Esta vulnerabilidad afecta a Firefox ESR versiones anteriores a 78.1, Firefox versiones anteriores a 79 y Thunderbird versiones anteriores a 78.1

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 cause a denial of service, obtain sensitive information, bypass iframe sandbox restrictions, confuse the user, or execute arbitrary code. It was discovered that redirected HTTP requests which are observed or modified through a web extension could bypass existing CORS checks. If a user were tricked in to installing a specially crafted extension, an attacker could potentially exploit this to obtain sensitive information across origins. Various other issues were also addressed.