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Fencer Intel
medium 6.8

CVE-2014-8638 json

The navigator.sendBeacon implementation in Mozilla Firefox before 35.0, Firefox ESR 31.x before 31.4, Thunderbird before 31.4, and SeaMonke…

published 2015-01-14 11 y ago modified 2026-06-17 4 mo ago also EUVD-2014-8475

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

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.

Patch / fix

  • firefox Ubuntu 14.04 LTS 35.0+build3-0ubuntu0.14.04.2
  • thunderbird Ubuntu 14.04 LTS 1:31.4.0+build1-0ubuntu0.14.04.1

ubuntu advisories UBUNTU-CVE-2014-8638

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 31.4.0-1.el5_11
  • thunderbird RHEL 6 31.4.0-1.el6_6
  • firefox RHEL 5 31.4.0-1.el5_11
  • firefox RHEL 6 31.4.0-1.el6_6
  • firefox RHEL 7 31.4.0-1.el7_0
  • xulrunner RHEL 7 31.4.0-1.el7_0

red hat advisories RHSA-2015:0047RHSA-2015:0046

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-8638 updated cvss 4.3

Mozilla: sendBeacon requests lack an Origin header (MFSA 2015-03)

  • Red Hat Enterprise Linux (v. 5 server) firefox 31.4.0-1.el5_11 Red Hat Enterprise Linux Client (v. 7) firefox 31.4.0-1.el7_0, xulrunner 31.4.0-1.el7_0 Red Hat Enterprise Linux Client Optional (v. 7) firefox 31.4.0-1.el7_0 Red Hat Enterprise Linux ComputeNode Optional (v. 7) xulrunner 31.4.0-1.el7_0 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 31.4.0-1.el5_11, thunderbird 31.4.0-1.el5_11 Red Hat Enterprise Linux Desktop (v. 6) firefox 31.4.0-1.el6_6, thunderbird 31.4.0-1.el6_6
    +2 more products
    Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 31.4.0-1.el6_6 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 31.4.0-1.el6_6
    fixed: vendor fix RHSA-2015:0046
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 31.4.0-1.el5_11
    fixed: vendor fix RHSA-2015:0047
  • Red Hat Enterprise Linux Server (v. 6) firefox 31.4.0-1.el6_6 Red Hat Enterprise Linux Server (v. 7) firefox 31.4.0-1.el7_0, xulrunner 31.4.0-1.el7_0 Red Hat Enterprise Linux Server Optional (v. 6) firefox 31.4.0-1.el6_6, thunderbird 31.4.0-1.el6_6 Red Hat Enterprise Linux Server Optional (v. 7) firefox 31.4.0-1.el7_0, xulrunner 31.4.0-1.el7_0 Red Hat Enterprise Linux Workstation (v. 6) firefox 31.4.0-1.el6_6, thunderbird 31.4.0-1.el6_6 Red Hat Enterprise Linux Workstation (v. 7) firefox 31.4.0-1.el7_0, xulrunner 31.4.0-1.el7_0
    +2 more products
    Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 31.4.0-1.el6_6 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 31.4.0-1.el7_0
    fixed: vendor fix RHSA-2015:0046

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.02% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-352 Cross-Site Request Forgery

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.