CVE-2020-6823

9.8 criticalEPSS 1.6%

Critical (9.8) in mozilla firefox. EPSS 1.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 75% of CVEs (scores of 2026-10-31)
CWE: CWE-862
Published: 2020-04-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1614919
https://www.mozilla.org/security/advisories/mfsa2020-12/
https://bugzilla.mozilla.org/show_bug.cgi?id=1614919
https://www.mozilla.org/security/advisories/mfsa2020-12/

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