What’s Vulnerable › Vulnerabilities

CVE-2014-8638

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2015-01-14 · updated 2026-06-17
• Weakness: CWE-352

Description

The navigator.sendBeacon implementation in Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird before 31.4, and SeaMonkey before 2.32 omits the CORS Origin header, which allows remote attackers to bypass intended CORS access-control checks and conduct cross-site request forgery (CSRF) attacks via a crafted web site.

Affected products

• Mozilla Firefox: through 34.0.5; 31.0, 31.1.0, 31.1.1, 31.3.0
• Mozilla Firefox ESR: 31.2
• Mozilla Seamonkey: through 2.31
• Mozilla Thunderbird: through 31.3.0

References

• http://linux.oracle.com/errata/ELSA-2015-0046.html
• http://linux.oracle.com/errata/ELSA-2015-0047.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00014.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00032.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00033.html
• http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00036.html
• http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00002.html
• http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html
• http://lists.opensuse.org/opensuse-updates/2015-01/msg00071.html
• http://rhn.redhat.com/errata/RHSA-2015-0046.html
• http://rhn.redhat.com/errata/RHSA-2015-0047.html
• http://secunia.com/advisories/62237

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