A previously installed malicious Android application with same signature-level permissions as Firefox can intercept AuthTokens meant for Fi…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-6250

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits: 0; none known

A previously installed malicious Android application with same signature-level permissions as Firefox can intercept AuthTokens meant for Firefox only. Note: This issue only affects Firefox for Android. Other versions and operating systems are unaffected. This vulnerability affects Firefox < 50.

Patch / fix

fixed in 1 distros 1

Mozilla Firefox 50

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10071-1

Exploit prediction

1.59% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1245791 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

Mozilla Firefox

Classification

Weakness

CWE-275 Permission Issues

References

bugzilla.mozilla.org /show_bug.cgi?id=1245791
exploit, issue-tracking, vendor-advisory
mozilla.org /security/advisories/mfsa2016-89/
vendor-advisory
securityfocus.com /bid/94337
vdb-entry, third-party-advisory
securitytracker.com /id/1037298
vdb-entry, third-party-advisory

Sources

CVE List CVE-2016-5299
NVD CVE-2016-5299

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