What’s Vulnerable › Vulnerabilities

CVE-2020-6823

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-04-24 · updated 2026-06-17
• Weakness: CWE-862

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.

Affected products

• Mozilla Firefox: before 75.0 — fixed in 75.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 75.0. Check the vendor advisory for mitigations.

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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