CVE-2016-9071

Severity: medium (CVSS 5.3 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-11 · updated 2026-06-17
Weakness: CWE-254

Description

Content Security Policy combined with HTTP to HTTPS redirection can be used by malicious server to verify whether a known site is within a user's browser history. 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=1285003
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=1285003
https://www.mozilla.org/security/advisories/mfsa2016-89/

Get alerted when CVE-2016-9071 or the next vulnerability affects your stack