What’s Vulnerable › Vulnerabilities

CVE-2018-5132

• Severity: medium (CVSS 6.5 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-200

Description

The Find API for WebExtensions can search some privileged pages, such as "about:debugging", if these pages are open in a tab. This could allow a malicious WebExtension to search for otherwise protected data if a user has it open. This vulnerability affects Firefox < 59.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10
• Mozilla Firefox: before 59.0 — fixed in 59.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 59.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/103386
• http://www.securitytracker.com/id/1040514
• https://bugzilla.mozilla.org/show_bug.cgi?id=1408194
• https://usn.ubuntu.com/3596-1/
• https://www.mozilla.org/security/advisories/mfsa2018-06/
• http://www.securityfocus.com/bid/103386
• http://www.securitytracker.com/id/1040514
• https://bugzilla.mozilla.org/show_bug.cgi?id=1408194
• https://usn.ubuntu.com/3596-1/
• https://www.mozilla.org/security/advisories/mfsa2018-06/

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