CVE-2014-8638: n/a vulnerability

CVE-2014-8638: The navigator.sendBeacon implementation in Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thund...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 13:26 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw affected older Mozilla-based clients. A malicious website could use sendBeacon without the expected Origin header, weakening CORS checks and enabling CSRF-style actions against sites that trusted that header behavior. Exposure is mainly legacy desktop or server-managed environments still running the affected Mozilla versions or OS packages. Modern supported versions should not be affected based on the fixed-version boundaries in the CVE description. Treat this as a legacy-client hygiene issue unless affected versions remain in production. Prioritize removal or update in managed desktops, VDI images, and long-lived server images. Mitigation focus: Upgrade Firefox to 35.0 or later and Firefox ESR/Thunderbird to 31.4 or later.; Upgrade SeaMonkey to 2.32 or later where still deployed.; Apply distribution vendor updates from Red Hat, Ubuntu, Debian, SUSE, Oracle, or Gentoo where applicable..

Prepared: Jun 14, 2026, 05:41 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jan 14, 2015, 11:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugzilla.mozilla.org/show_bug.cgi?id=1080987CVE reference · x_refsource_CONFIRM
GLSA-201504-01CVE reference · vendor-advisory, x_refsource_GENTOO
firefox-cve20148638-csrf(99958)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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