CVE-2016-5299

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-06-11 · updated 2026-06-17
Weakness: CWE-275

Description

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.

Affected products

Mozilla Firefox: before 50.0 — fixed in 50.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 50.0. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/94337
http://www.securitytracker.com/id/1037298
https://bugzilla.mozilla.org/show_bug.cgi?id=1245791
https://www.mozilla.org/security/advisories/mfsa2016-89/
http://www.securityfocus.com/bid/94337
http://www.securitytracker.com/id/1037298
https://bugzilla.mozilla.org/show_bug.cgi?id=1245791
https://www.mozilla.org/security/advisories/mfsa2016-89/

Get alerted when CVE-2016-5299 or the next vulnerability affects your stack