CVE-2018-12403

Name: CVE-2018-12403
Creator: NVD / NIST
Published: 2019-02-28T18:29:01.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.87%

Last modified Jun 17, 2026

CVE-2018-12403 is a vulnerability of currently unknown severity. If a site is loaded over a HTTPS connection but loads a favicon resource over HTTP, the mixed content warning is not displayed to users. This vulnerability affects Firefox < 63.. EPSS estimates a 1.87% chance of exploitation in the next 30 days.

Description

If a site is loaded over a HTTPS connection but loads a favicon resource over HTTP, the mixed content warning is not displayed to users. This vulnerability affects Firefox < 63.

Metrics

EPSS Probability

1.87%

76.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 63.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10

References

http://www.securityfocus.com/bid/105721Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041944Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1484753Issue Tracking, Permissions Required, Vendor Advisory
https://usn.ubuntu.com/3801-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-26/Vendor Advisory
http://www.securityfocus.com/bid/105721Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041944Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1484753Issue Tracking, Permissions Required, Vendor Advisory
https://usn.ubuntu.com/3801-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2018-26/Vendor Advisory

Timeline

Published: Feb 28, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12403?

If a site is loaded over a HTTPS connection but loads a favicon resource over HTTP, the mixed content warning is not displayed to users. This vulnerability affects Firefox < 63.

How severe is CVE-2018-12403?

Severity scoring for CVE-2018-12403 is pending analysis. The EPSS model estimates a 1.87% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12403?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-12403?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST