CVE-2016-5294

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-06-11 · updated 2026-06-17
Weakness: CWE-20

Description

The Mozilla Updater can be made to choose an arbitrary target working directory for output files resulting from the update process. This vulnerability requires local system access. Note: this issue only affects Windows operating systems. This vulnerability affects Thunderbird < 45.5, Firefox ESR < 45.5, and Firefox < 50.

Affected products

Mozilla Firefox: before 45.5.0; before 50.0 — fixed in 45.5.0, 50.0
Mozilla Thunderbird: before 45.5.0 — fixed in 45.5.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 45.5.0, 50.0; Mozilla Thunderbird 45.5.0. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/94336
http://www.securitytracker.com/id/1037298
https://bugzilla.mozilla.org/show_bug.cgi?id=1246972
https://security.gentoo.org/glsa/201701-15
https://www.mozilla.org/security/advisories/mfsa2016-89/
https://www.mozilla.org/security/advisories/mfsa2016-90/
https://www.mozilla.org/security/advisories/mfsa2016-93/
http://www.securityfocus.com/bid/94336
http://www.securitytracker.com/id/1037298
https://bugzilla.mozilla.org/show_bug.cgi?id=1246972
https://security.gentoo.org/glsa/201701-15
https://www.mozilla.org/security/advisories/mfsa2016-89/

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