What’s Vulnerable › Vulnerabilities

CVE-2018-12397

• Severity: high (CVSS 7.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-02-28 · updated 2026-06-17
• Weakness: CWE-200

Description

A WebExtension can request access to local files without the warning prompt stating that the extension will "Access your data for all websites" being displayed to the user. This allows extensions to run content scripts in local pages without permission warnings when a local file is opened. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 18.10
• Debian Linux: 8.0, 9.0
• Mozilla Firefox: before 60.3.0; before 63.0 — fixed in 60.3.0, 63.0
• RedHat Enterprise Linux Desktop: 6.0, 7.0
• RedHat Enterprise Linux Server: 6.0, 7.0
• RedHat Enterprise Linux Server Eus: 7.5
• RedHat Enterprise Linux Workstation: 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 60.3.0, 63.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/105718
• http://www.securitytracker.com/id/1041944
• https://access.redhat.com/errata/RHSA-2018:3005
• https://access.redhat.com/errata/RHSA-2018:3006
• https://bugzilla.mozilla.org/show_bug.cgi?id=1487478
• https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
• https://security.gentoo.org/glsa/201811-04
• https://usn.ubuntu.com/3801-1/
• https://www.debian.org/security/2018/dsa-4324
• https://www.mozilla.org/security/advisories/mfsa2018-26/
• https://www.mozilla.org/security/advisories/mfsa2018-27/
• http://www.securityfocus.com/bid/105718

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