CVE-2016-5268: Mozilla Firefox

Medium severity, CVSS 4.3. EPSS: 1.2% chance of exploitation in the next 30 days.

Mozilla Firefox before 48.0 does not properly set the LINKABLE and URI_SAFE_FOR_UNTRUSTED_CONTENT flags of about: URLs that are used for error pages, which makes it easier for remote attackers to conduct spoofing attacks via a crafted URL, as demonstrated by misleading text after an about:neterror?d= substring.

Affected products

• Mozilla Firefox: up to and including 47.0.1

Published 2016-08-05. Last modified 2026-06-17.