CVE-2017-7820

Published: 02 October 2017

The "instanceof" operator can bypass the Xray wrapper mechanism. When called on web content from the browser itself or an extension the web content can provide its own result for that operator, possibly tricking the browser or extension into mishandling the element. This vulnerability affects Firefox < 56.

Priority

Low

CVSS 3 base score: 5.3

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
Upstream
Released (56.0)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (56.0+build6-0ubuntu1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (56.0+build6-0ubuntu0.16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was released [56.0+build6-0ubuntu0.14.04.1])