CVE-2015-4490

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-08-16 · updated 2026-06-17
Weakness: CWE-79

Description

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: 12.04, 14.04, 15.04
Mozilla Firefox: through 39.0.3
Opensuse: 13.1, 13.2
Oracle Corporation Solaris Operating System: 11.3

References

http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html
http://www.mozilla.org/security/announce/2015/mfsa2015-91.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.securitytracker.com/id/1033247
http://www.ubuntu.com/usn/USN-2702-1
http://www.ubuntu.com/usn/USN-2702-2
http://www.ubuntu.com/usn/USN-2702-3
https://bugzilla.mozilla.org/show_bug.cgi?id=1086999
https://security.gentoo.org/glsa/201605-06
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html

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