CVE-2016-2817

5.4 mediumEPSS 1.3%

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.

Severity

CVSS 3.0

5.4 medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS: 1.3% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-31)
CWE: CWE-264
Published: 2016-04-30
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00005.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00038.html
http://www.mozilla.org/security/announce/2016/mfsa2016-46.html
http://www.securitytracker.com/id/1035692
http://www.ubuntu.com/usn/USN-2936-1

Check your stack JSON