VULNERABILITY INTELLIGENCE

CVE-2020-6823

CVSS score9.8 CRITICAL

EPSS probability1.61%

CISA KEVNot currently listed

Published2020-04-24

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

A malicious extension could have called <code>browser.identity.launchWebAuthFlow</code>, controlling the redirect_uri, and through the Promise returned, obtain the Auth code and gain access to the user's account at the service provider. This vulnerability affects Firefox < 75.

Weakness classification

CWE-862: Missing Authorization

Primary references

security@mozilla.org — Issue Tracking, Vendor Advisory
security@mozilla.org — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory