What’s Vulnerable › Vulnerabilities

CVE-2018-5175

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-79

Description

A mechanism to bypass Content Security Policy (CSP) protections on sites that have a "script-src" policy of "'strict-dynamic'". If a target website contains an HTML injection flaw an attacker could inject a reference to a copy of the "require.js" library that is part of Firefox's Developer Tools, and then use a known technique using that library to bypass the CSP restrictions on executing injected scripts. This vulnerability affects Firefox < 60.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10, 18.04
• Mozilla Firefox: before 60.0 — fixed in 60.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 60.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/104139
• http://www.securitytracker.com/id/1040896
• https://bugzilla.mozilla.org/show_bug.cgi?id=1432358
• https://usn.ubuntu.com/3645-1/
• https://www.mozilla.org/security/advisories/mfsa2018-11/
• http://www.securityfocus.com/bid/104139
• http://www.securitytracker.com/id/1040896
• https://bugzilla.mozilla.org/show_bug.cgi?id=1432358
• https://usn.ubuntu.com/3645-1/
• https://www.mozilla.org/security/advisories/mfsa2018-11/

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