How severe is CVE-2014-8638?

CVE-2014-8638 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2014-8638 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-8638?

CVE-2014-8638 primarily affects Mozilla Firefox. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-8638?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2014-8638 published?

CVE-2014-8638 was published on 2015-01-14 and last updated on 2026-06-17.

CVE-2014-8638

CVE-2014-8638 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Mozilla Firefox
Published: 2015-01-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2014-8638?: 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.
How severe is CVE-2014-8638?: CVE-2014-8638 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2014-8638 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-8638?: CVE-2014-8638 primarily affects Mozilla Firefox. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-8638?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2014-8638 published?: CVE-2014-8638 was published on 2015-01-14 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:mozilla:firefox:31.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.1.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.1.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:31.3.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:31.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*

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