Vulnerability in Mozilla Firefox

CVE-2018-12396

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. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

EPSS: 0.023 (81.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2018-12396?
CVE-2018-12396 is a medium-severity vulnerability in Mozilla Firefox, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.5/10. Published 2019-02-28.
How severe is CVE-2018-12396?
Medium severity. CVSS v3 base score is 6.5 out of 10.