medium
6.5
CWE
732
Advisory Published
CVE Published
Updated

CVE-2018-12396

First published: Tue Oct 23 2018(Updated: )

A vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events. This allows for potential privilege escalation by the WebExtension on sites where content scripts should not be run.

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Mozilla Firefox ESR<60.3
60.3
Mozilla Firefox<63
63
Mozilla Firefox<63.0
Mozilla Firefox ESR<60.3
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
Redhat Enterprise Linux Desktop=6.0
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Server=6.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Aus=7.6
Redhat Enterprise Linux Server Eus=7.6
Redhat Enterprise Linux Server Tus=7.6
Redhat Enterprise Linux Workstation=6.0
Redhat Enterprise Linux Workstation=7.0
debian/firefox
133.0.3-1
debian/firefox-esr
115.14.0esr-1~deb11u1
128.5.0esr-1~deb11u1
128.3.1esr-1~deb12u1
128.5.0esr-1~deb12u1
128.5.0esr-1
128.5.1esr-1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2018-12396?

    CVE-2018-12396 is a vulnerability where a WebExtension can run content scripts in disallowed contexts following navigation or other events, potentially allowing for privilege escalation.

  • Which software versions are affected by CVE-2018-12396?

    Firefox ESR < 60.3 and Firefox < 63.0 are affected by CVE-2018-12396.

  • What is the severity of CVE-2018-12396?

    CVE-2018-12396 has a severity rating of 6.5, which is considered medium.

  • How can I fix CVE-2018-12396?

    To fix CVE-2018-12396, update Firefox ESR to version 60.3 or later, or update Firefox to version 63.0 or later.

  • Where can I find more information about CVE-2018-12396?

    You can find more information about CVE-2018-12396 on the following references: [Mozilla Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1483602), [Mozilla Security Advisory](https://www.mozilla.org/en-US/security/advisories/mfsa2018-27/), [CVE Mitre](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12396).

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