Vulnerability in Mozilla Firefox

CVE-2016-2817

The WebExtension sandbox feature in browser/components/extensions/ext-tabs.js in Mozilla Firefox before 46.0 does not properly restrict principal inheritance during chrome.tabs.create and chrome.tabs.update API calls, which allows remote attackers to conduct Universal XSS (UXSS) attacks via a crafted extension that accesses a (1) javascript: or (2) data: URL.

EPSS: 0.013 (66.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2016-2817?
CVE-2016-2817 is a medium-severity vulnerability in Mozilla Firefox, classified under CWE-264. CVSS score: 5.4/10. Published 2016-04-30.
How severe is CVE-2016-2817?
Medium severity. CVSS v3 base score is 5.4 out of 10.