CVE-2018-18499 — Mozilla: Same-origin policy violation using meta refresh and performance.getEntries to steal cross-origin URLs

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MEDIUM

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

Published Feb 28, 2019

6.5

MEDIUM

CVSS 3.0

EPSS 1.09%

Description

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.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <62
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <60.2
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <60.2.1

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mozilla

Firefox

n/a

Version	Status	Constraints
unspecified	affected	<62

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<60.2

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<60.2.1

Red Hat Enterprise Linux 6

firefox-0:60.2.0-1.el6

Fixed · RHSA-2018:2693
Red Hat Enterprise Linux 6

thunderbird-0:60.2.1-5.el6

Fixed · RHSA-2018:3403
Red Hat Enterprise Linux 7

firefox-0:60.2.0-1.el7_5

Fixed · RHSA-2018:2692
Red Hat Enterprise Linux 7

thunderbird-0:60.2.1-4.el7_5

Fixed · RHSA-2018:3458
Red Hat Enterprise Linux 5

firefox

Out of support scope
Red Hat Enterprise Linux 5

thunderbird

Out of support scope
Red Hat Enterprise Linux 8

firefox

Not affected
Red Hat Enterprise Linux 8

thunderbird

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox-0:60.2.0-1.el6	Fixed	RHSA-2018:2693
Red Hat Enterprise Linux 6	thunderbird-0:60.2.1-5.el6	Fixed	RHSA-2018:3403
Red Hat Enterprise Linux 7	firefox-0:60.2.0-1.el7_5	Fixed	RHSA-2018:2692
Red Hat Enterprise Linux 7	thunderbird-0:60.2.1-4.el7_5	Fixed	RHSA-2018:3458
Red Hat Enterprise Linux 5	firefox	Out of support scope	n/a
Red Hat Enterprise Linux 5	thunderbird	Out of support scope	n/a
Red Hat Enterprise Linux 8	firefox	Not affected	n/a
Red Hat Enterprise Linux 8	thunderbird	Not affected	n/a

Remediation

No remediation recorded yet.

Metrics

1.09% 0.01093

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01093

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.09% (0.01093)	64.21th	v5 (v2026.06.15)
Sep 20, 2026	1.09% (0.01093)	63.97th	v5 (v2026.06.15)
Jul 20, 2024	0.20% (0.00198)	57.81th	v3 (v2023.03.01)
Feb 22, 2024	0.20% (0.00198)	56.49th	v3 (v2023.03.01)
Mar 7, 2023	0.16% (0.00159)	50.67th	v3 (v2023.03.01)
Mar 6, 2023	1.02% (0.01018)	40.69th	v2 (v2022.01.01)
Feb 4, 2022	1.02% (0.01018)	19.50th	v2 (v2022.01.01)
Feb 3, 2022	1.04% (0.01040)	28.32th	v5 (v2026.06.15)
Apr 14, 2021	1.04% (0.01040)	0.00th	v1

Weaknesses (2)

CWE-346

CWE-829

References (9)

https://access.redhat.com/security/cve/CVE-2018-18499
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1468523
x_refsource_CONFIRMIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1849971
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2018-18499
https://www.cve.org/CVERecord?id=CVE-2018-18499
https://www.mozilla.org/en-US/security/advisories/mfsa2018-21/#CVE-2018-18499
https://www.mozilla.org/security/advisories/mfsa2018-20/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-21/
x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-25/
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2018-18499		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1468523		x_refsource_CONFIRMIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1849971		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2018-18499
https://www.cve.org/CVERecord?id=CVE-2018-18499
https://www.mozilla.org/en-US/security/advisories/mfsa2018-21/#CVE-2018-18499
https://www.mozilla.org/security/advisories/mfsa2018-20/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-21/		x_refsource_CONFIRMVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2018-25/		x_refsource_CONFIRMVendor Advisory