Related Vulnerabilities: CVE-2020-15677  

An issue has been found in Firefox before 81.0 where, by exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from.

Severity Medium

Remote Yes

Type Content spoofing

Description

An issue has been found in Firefox before 81.0 where, by exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from.

AVG-1235 firefox 80.0.1-1 81.0-1 High Fixed

https://www.mozilla.org/en-US/security/advisories/mfsa2020-42/#CVE-2020-15677
https://bugzilla.mozilla.org/show_bug.cgi?id=1641487