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Fencer Vulns
medium 6.5

CVE-2018-18499 json

A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv="refresh" on a page to cause a r…

published 2019-02-28 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10224

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv="refresh" on a page to cause a redirection to another site using performance.getEntries(). This is a same-origin policy violation and could allow for data theft. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

Patch / fix

  • Mozilla Firefox 62
  • Mozilla Firefox ESR 60.2
  • Mozilla Thunderbird 60.2.1
  • firefox-esr Debian 14, Debian 13, Debian 12 60.2.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:60.2.1-1

debian advisories DEBIAN-CVE-2018-18499

  • firefox Ubuntu 16.04 LTS 62.0+build2-0ubuntu0.16.04.3
  • thunderbird Ubuntu 14.04 LTS 1:60.2.1+build1-0ubuntu0.14.04.2
  • thunderbird Ubuntu 16.04 LTS 1:60.2.1+build1-0ubuntu0.16.04.4
  • thunderbird Ubuntu 18.04 LTS 1:60.2.1+build1-0ubuntu0.18.04.2

ubuntu advisories UBUNTU-CVE-2018-18499

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 7 60.2.1-4.el7_5
  • thunderbird RHEL 6 60.2.1-5.el6
  • firefox RHEL 7 60.2.0-1.el7_5
  • firefox RHEL 6 60.2.0-1.el6

red hat advisories RHSA-2018:3458RHSA-2018:3403RHSA-2018:2692RHSA-2018:2693

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-2018-18499 updated cvss 6.5

Mozilla: Same-origin policy violation using meta refresh and performance.getEntries to steal cross-origin URLs

  • Red Hat Enterprise Linux 5 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux Client (v. 7) firefox 60.2.0-1.el7_5, thunderbird 60.2.1-4.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.2.0-1.el7_5
    fixed: vendor fix RHSA-2018:2692
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.2.0-1.el6, thunderbird 60.2.1-5.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.2.0-1.el6
    fixed: vendor fix RHSA-2018:2693
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.2.0-1.el7_5
    fixed: vendor fix RHSA-2018:2692
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 60.2.1-4.el7_5
    fixed: vendor fix RHSA-2018:3458
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.2.0-1.el6 Red Hat Enterprise Linux Server (v. 6) firefox 60.2.0-1.el6
    fixed: vendor fix RHSA-2018:2693
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.2.0-1.el7_5
    fixed: vendor fix RHSA-2018:2692
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.2.0-1.el6, thunderbird 60.2.1-5.el6
    fixed: vendor fix RHSA-2018:2693
show 6 more
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.2.0-1.el7_5, thunderbird 60.2.1-4.el7_5
    fixed: vendor fix RHSA-2018:2692
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.2.0-1.el6, thunderbird 60.2.1-5.el6
    fixed: vendor fix RHSA-2018:2693
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.2.0-1.el7_5, thunderbird 60.2.1-4.el7_5
    fixed: vendor fix RHSA-2018:2692
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.2.0-1.el6
    fixed: vendor fix RHSA-2018:2693
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.2.0-1.el7_5
    fixed: vendor fix RHSA-2018:2692
  • Red Hat Enterprise Linux 8 firefox, thunderbird
    not affected: vulnerable code not present

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

1.09% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Classification

Weakness

References

Sources

Fencer Vulns 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.