CVE-2020-6823
Mozilla: Malicious Extension could obtain auth codes from OAuth login flows
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 10, 2020
Updated · June 27, 2026
Description
The Mozilla Foundation Security Advisory describes this flaw as:
A malicious extension could have called browser.identity.launchWebAuthFlow, 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.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-358 · Improperly Implemented Security Check for Standard