CVE-2020-12412

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-09 · updated 2026-06-17

Description

By navigating a tab using the history API, an attacker could cause the address bar to display the incorrect domain (with the https:// scheme, a blocked port number such as '1', and without a lock icon) while controlling the page contents. This vulnerability affects Firefox < 70.

Affected products

Mozilla Firefox: before 70.0 — fixed in 70.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 70.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1528587
https://www.mozilla.org/security/advisories/mfsa2019-34/
https://bugzilla.mozilla.org/show_bug.cgi?id=1528587
https://www.mozilla.org/security/advisories/mfsa2019-34/

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