CVE-2020-12390

CRITICAL 9.8CVE-2020-12390 · Published 26/05/2020 · updated 17/06/2026

In short

CVE-2020-12390 is a CRITICAL (CVSS 9.8) vulnerability affecting firefox (mozilla).
Chance of exploitation in the next 30 days (EPSS): 1.6%, higher than 76.2% of all vulnerabilities.
Fix: update to 76.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 76.0`	`76.0`

Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks. This vulnerability affects Firefox < 76.

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Package

Affected versions

Patched versions

< 76.0

76.0

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