XSS in Mozilla Firefox

CVE-2015-4490

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.029 (85.7th percentile) — read the EPSS interpretation.

Affected products

Weakness classification (CWE)

References