Files with the .JNLP extension used for "Java web start" applications are not treated as executable content for download prompts even thoug…

published 2019-07-23 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-3366

cvss: 7.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

Files with the .JNLP extension used for "Java web start" applications are not treated as executable content for download prompts even though they can be executed if Java is installed on the local system. This could allow users to mistakenly launch an executable binary locally. This vulnerability affects Firefox < 67.

Patch / fix

fixed in 1 distros 3

Mozilla Firefox 67

ubuntu opensuse arch linux

firefox Ubuntu 16.04 LTS 67.0+build2-0ubuntu0.16.04.1
firefox Ubuntu 18.04 LTS 67.0+build2-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2019-11696

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1

firefox Arch Linux 67.0-1

arch linux advisories AVG-966

Exploit prediction

0.84% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1392955 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.8	CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Mozilla Firefox

Classification

Weakness

CWE-20 Improper Input Validation

References

bugzilla.mozilla.org /show_bug.cgi?id=1392955
exploit, issue-tracking, vendor-advisory
mozilla.org /security/advisories/mfsa2019-13/
vendor-advisory

Sources

CVE List CVE-2019-11696
NVD CVE-2019-11696

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary