Auth bypass in Mozilla Firefox
CVE-2018-12399
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.016 (74.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.016 · change: +0.002
Affected products
- Mozilla Firefox — versions unspecified
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
Weakness classification (CWE)
References
- www.mozilla.org/security/advisories/mfsa2018-26/ (Vendor Advisory)
- www.securityfocus.com/bid/105721 (VDB Entry, Third Party Advisory, vdb-entry)
- usn.ubuntu.com/3801-1/ (vendor-advisory, Third Party Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Vendor Advisory, Permissions Required, Issue Tracking)
- www.securitytracker.com/id/1041944 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2018-12399?
- CVE-2018-12399 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Authentication. CVSS score: 4.3/10. Published 2019-02-28.
- How severe is CVE-2018-12399?
- Medium severity. CVSS v3 base score is 4.3 out of 10.