CVE-2016-1954: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 2.3% chance of exploitation in the next 30 days.

The nsCSPContext::SendReports function in dom/security/nsCSPContext.cpp in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 does not prevent use of a non-HTTP report-uri for a Content Security Policy (CSP) violation report, which allows remote attackers to cause a denial of service (data overwrite) or possibly gain privileges by specifying a URL of a local file.

Affected products

• Mozilla Firefox: up to and including 44.0.2; version 38.0 only; version 38.0.1 only; version 38.0.5 only; version 38.1.0 only; version 38.1.1 only; …
• Mozilla Thunderbird: up to and including 38.6.0
• Novell Suse Package Hub For Suse Linux Enterprise: version 12 only
• Opensuse Leap: version 42.1 only
• Opensuse Opensuse: version 13.1 only; version 13.2 only
• Oracle Linux: version 5.0 only; version 6 only; version 7 only

Published 2016-03-13. Last modified 2026-06-17.