Auth bypass in Mozilla Firefox

CVE-2018-5135

WebExtensions can bypass normal restrictions in some circumstances and use "browser.tabs.executeScript" to inject scripts into contexts where this should not be allowed, such as pages from other WebExtensions or unprivileged "about:" pages. This vulnerability affects Firefox < 59.

Vulnerability class: Broken Access Control

EPSS: 0.015 (72.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2018-5135?
CVE-2018-5135 is a high-severity vulnerability in Mozilla Firefox, classified under Missing Authorization. CVSS score: 7.5/10. Published 2018-06-11.
How severe is CVE-2018-5135?
High severity. CVSS v3 base score is 7.5 out of 10.