CVE-2015-4490: Canonical Ubuntu Linux

Medium severity, CVSS 4.3. EPSS: 2.9% chance of exploitation in the next 30 days.

The nsCSPHostSrc::permits function in dom/security/nsCSPUtils.cpp in Mozilla Firefox before 40.0 does not implement the Content Security Policy Level 2 exceptions for the blob, data, and filesystem URL schemes during wildcard source-expression matching, which might make it easier for remote attackers to conduct cross-site scripting (XSS) attacks by leveraging unexpected policy-enforcement behavior.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.04 only
• Mozilla Firefox: up to and including 39.0.3
• Opensuse Opensuse: version 13.1 only; version 13.2 only
• Oracle Solaris: version 11.3 only

Published 2015-08-16. Last modified 2026-06-17.