Information disclosure in Mozilla Firefox

CVE-2018-12397

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.

Vulnerability class: Information Disclosure

EPSS: 0.004 (29.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2018-12397?
CVE-2018-12397 is a high-severity vulnerability in Mozilla Firefox, classified under Information Disclosure. CVSS score: 7.1/10. Published 2019-02-28.
How severe is CVE-2018-12397?
High severity. CVSS v3 base score is 7.1 out of 10.