XSS in Mozilla Firefox

CVE-2018-5124

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.010 (59.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Mozilla Firefox
N/a Firefox — versions All versions prior to Firefox 58.0.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

security@mozilla.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2018-5124?: CVE-2018-5124 is a medium-severity vulnerability in Mozilla Firefox, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-04-26.
How severe is CVE-2018-5124?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2018-5124 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.