What’s Vulnerable › Vulnerabilities

CVE-2018-5152

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% 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-327

Description

WebExtensions with the appropriate permissions can attach content scripts to Mozilla sites such as accounts.firefox.com and listen to network traffic to the site through the "webRequest" API. For example, this allows for the interception of username and an encrypted password during login to Firefox Accounts. This issue does not expose synchronization traffic directly and is limited to the process of user login to the website and the data displayed to the user once logged in. 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=1415644
• https://bugzilla.mozilla.org/show_bug.cgi?id=1427289
• 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=1415644
• https://bugzilla.mozilla.org/show_bug.cgi?id=1427289
• https://usn.ubuntu.com/3645-1/
• https://www.mozilla.org/security/advisories/mfsa2018-11/

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