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CVE-2018-5124

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code...

6.1 MediumFix available

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code execution in Firefox before version 58.0.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

1.01%Up 0.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.1

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code execution in Firefox before version 58.0.1.

Record
CVE-2018-5124
CVSS 3.0
6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0
4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness
CWE-79
Updated
2026-11-02
CVE List No score

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code execution in Firefox before version 58.0.1.

Record
CVE-2018-5124
Updated
2026-11-02
EUVDEUVD-2018-16910 No score

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code execution in Firefox before version 58.0.1.

Record
EUVD-2018-16910
Updated
2026-11-03
GitHub AdvisoriesGHSA-x85x-whmj-686x 6.1

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code...

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code execution in Firefox before version 58.0.1.

Record
GHSA-x85x-whmj-686x
CVSS 3.0
6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSVUBUNTU-CVE-2018-5124 6.1

Unsanitized output in the browser UI leaves HTML tags in place and can result in arbitrary code execution in Firefox before version 58.0.1.

Record
UBUNTU-CVE-2018-5124
CVSS 3.0
6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVUSN-3552-1 No score

firefox vulnerability

Johann Hofmann discovered that HTML fragments created for chrome-privileged documents were not properly sanitized. An attacker could exploit this to execute arbitrary code. (CVE-2018-5124)

Record
USN-3552-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
firefox
Ubuntu:14.04:LTS
 before 58.0.1+build1-0ubuntu0.14.04.1, plus listed versions
24.0+build1-0ubuntu125.0+build3-0ubuntu0.13.10.128.0~b2+build1-0ubuntu228.0+build1-0ubuntu128.0+build2-0ubuntu1
Show 45 moreShow less
28.0+build2-0ubuntu229.0+build1-0ubuntu0.14.04.230.0+build1-0ubuntu0.14.04.331.0+build1-0ubuntu0.14.04.132.0+build1-0ubuntu0.14.04.132.0.3+build1-0ubuntu0.14.04.133.0+build2-0ubuntu0.14.04.134.0+build2-0ubuntu0.14.04.135.0+build3-0ubuntu0.14.04.235.0.1+build1-0ubuntu0.14.04.136.0+build2-0ubuntu0.14.04.436.0.1+build2-0ubuntu0.14.04.136.0.4+build1-0ubuntu0.14.04.137.0+build2-0ubuntu0.14.04.137.0.1+build1-0ubuntu0.14.04.137.0.2+build1-0ubuntu0.14.04.138.0+build3-0ubuntu0.14.04.139.0+build5-0ubuntu0.14.04.139.0.3+build2-0ubuntu0.14.04.140.0+build4-0ubuntu0.14.04.140.0+build4-0ubuntu0.14.04.440.0.3+build1-0ubuntu0.14.04.141.0+build3-0ubuntu0.14.04.141.0.1+build2-0ubuntu0.14.04.141.0.2+build2-0ubuntu0.14.04.142.0+build2-0ubuntu0.14.04.143.0+build1-0ubuntu0.14.04.143.0.4+build3-0ubuntu0.14.04.144.0+build3-0ubuntu0.14.04.144.0.1+build2-0ubuntu0.14.04.144.0.2+build1-0ubuntu0.14.04.145.0+build2-0ubuntu0.14.04.145.0.1+build1-0ubuntu0.14.04.245.0.2+build1-0ubuntu0.14.04.146.0+build5-0ubuntu0.14.04.246.0.1+build1-0ubuntu0.14.04.347.0+build3-0ubuntu0.14.04.148.0+build2-0ubuntu0.14.04.149.0+build4-0ubuntu0.14.04.149.0.2+build2-0ubuntu0.14.04.150.0+build2-0ubuntu0.14.04.250.0.2+build1-0ubuntu0.14.04.150.1.0+build2-0ubuntu0.14.04.151.0.1+build2-0ubuntu0.14.04.151.0.1+build2-0ubuntu0.14.04.2
58.0.1+build1-0ubuntu0.14.04.1
firefox
Ubuntu:16.04:LTS
 before 58.0.1+build1-0ubuntu0.16.04.1, plus listed versions
41.0.2+build2-0ubuntu142.0+build2-0ubuntu144.0+build3-0ubuntu244.0.1+build1-0ubuntu144.0.2+build1-0ubuntu1
Show 31 moreShow less
45.0+build2-0ubuntu145.0.1+build1-0ubuntu145.0.2+build1-0ubuntu146.0+build5-0ubuntu0.16.04.246.0.1+build1-0ubuntu0.16.04.247.0+build3-0ubuntu0.16.04.148.0+build2-0ubuntu0.16.04.149.0+build4-0ubuntu0.16.04.149.0.2+build2-0ubuntu0.16.04.250.0+build2-0ubuntu0.16.04.250.0.2+build1-0ubuntu0.16.04.150.1.0+build2-0ubuntu0.16.04.151.0.1+build2-0ubuntu0.16.04.151.0.1+build2-0ubuntu0.16.04.252.0+build2-0ubuntu0.16.04.152.0.1+build2-0ubuntu0.16.04.152.0.2+build1-0ubuntu0.16.04.153.0+build6-0ubuntu0.16.04.153.0.2+build1-0ubuntu0.16.04.253.0.3+build1-0ubuntu0.16.04.254.0+build3-0ubuntu0.16.04.155.0.1+build2-0ubuntu0.16.04.255.0.2+build1-0ubuntu0.16.04.156.0+build6-0ubuntu0.16.04.156.0+build6-0ubuntu0.16.04.257.0+build4-0ubuntu0.16.04.557.0+build4-0ubuntu0.16.04.657.0.1+build2-0ubuntu0.16.04.157.0.3+build1-0ubuntu0.16.04.157.0.4+build1-0ubuntu0.16.04.158.0+build6-0ubuntu0.16.04.1
58.0.1+build1-0ubuntu0.16.04.1
firefox
Ubuntu:18.04:LTS
 before 59.0.1+build1-0ubuntu1, plus listed versions
56.0+build6-0ubuntu157.0.1+build2-0ubuntu1
59.0.1+build1-0ubuntu1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-5124 is a medium vulnerability (CVSS 6.1) in Mozilla Firefox, published January 30, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.01%, the 63rd percentile. Fixed in firefox 58.0.1+build1-0ubuntu0.14.04.1.

References

This page doesn't list everything

Left out here: 17 versions. The JSON record has them.

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