What is CVE-2016-1942?

CVE-2016-1942 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2016-01-31.

How severe is CVE-2016-1942?

High severity. CVSS v3 base score is 7.4 out of 10.

Improper input validation in Mozilla Firefox

CVE-2016-1942

Mozilla Firefox before 44.0 allows user-assisted remote attackers to spoof a trailing substring in the address bar by leveraging a user's paste of a (1) wyciwyg: URI or (2) resource: URI.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2016-01-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Mozilla Firefox
openSUSE Leap — versions 42.1
openSUSE — versions 13.1, 13.2

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

bugzilla.mozilla.org/show_bug.cgi
www.securitytracker.com/id/1034825 (vdb-entry)
www.ubuntu.com/usn/USN-2880-1 (vendor-advisory)
www.ubuntu.com/usn/USN-2880-2 (vendor-advisory)
lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html (vendor-advisory)
www.securityfocus.com/bid/81948 (vdb-entry)
security.gentoo.org/glsa/201605-06 (vendor-advisory)
www.mozilla.org/security/announce/2016/mfsa2016-09.html (Vendor Advisory)
lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html (vendor-advisory)

Frequently asked questions

What is CVE-2016-1942?: CVE-2016-1942 is a high-severity vulnerability in Mozilla Firefox, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2016-01-31.
How severe is CVE-2016-1942?: High severity. CVSS v3 base score is 7.4 out of 10.