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CVE-2018-12399

4.3 · MEDIUM

When a new protocol handler is registered, the API accepts a title argument which can be used to mislead users about which domain is registering the new protocol.

Published Feb 28, 2019CWE-287EPSS 1.57%

Overview

CVE-2018-12399 is a medium-severity vulnerability. It was published on February 28, 2019 and has a CVSS 3.0 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

When a new protocol handler is registered, the API accepts a title argument which can be used to mislead users about which domain is registering the new protocol. This may result in the user approving a protocol handler that they otherwise would not have. This vulnerability affects Firefox < 63.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/105721Refwww.securitytracker.com/id/1041944Refbugzilla.mozilla.org/show_bug.cgi?id=1490276Refusn.ubuntu.com/3801-1/Refwww.mozilla.org/security/advisories/mfsa2018-26/Refwww.securityfocus.com/bid/105721Refwww.securitytracker.com/id/1041944Refbugzilla.mozilla.org/show_bug.cgi?id=1490276Refusn.ubuntu.com/3801-1/Refwww.mozilla.org/security/advisories/mfsa2018-26/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-12399?

CVE-2018-12399 is a medium-severity vulnerability. It was published on February 28, 2019 and has a CVSS 3.0 base score of 4.3 (MEDIUM).

How severe is CVE-2018-12399?

This vulnerability has a CVSS 3.0 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-12399?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-12399?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-12399 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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