What’s Vulnerable › Vulnerabilities

CVE-2018-5124

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-26 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• Mozilla Firefox: before 58.0.1 — fixed in 58.0.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 58.0.1. Check the vendor advisory for mitigations.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2018-05/
• https://www.mozilla.org/en-US/security/advisories/mfsa2018-05/

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