What is CVE-2016-2826?

CVE-2016-2826 is a high-severity vulnerability in Microsoft Windows, classified under CWE-264. CVSS score: 7.8/10. Published 2016-06-13.

How severe is CVE-2016-2826?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Microsoft Windows

CVE-2016-2826

The maintenance service in Mozilla Firefox before 47.0 and Firefox ESR 45.x before 45.2 on Windows does not prevent MAR extracted-file modification during updater execution, which might allow local users to gain privileges via a Trojan horse file.

Published 2016-06-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (25.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Microsoft Windows
Mozilla Firefox — versions 45.1.0, 45.1.1

Weakness classification (CWE)

CWE-264

References

www.securitytracker.com/id/1036057 (vdb-entry)
www.mozilla.org/security/announce/2016/mfsa2016-55.html (Vendor Advisory)
bugzilla.mozilla.org/show_bug.cgi
www.securityfocus.com/bid/91075 (vdb-entry)

Frequently asked questions

What is CVE-2016-2826?: CVE-2016-2826 is a high-severity vulnerability in Microsoft Windows, classified under CWE-264. CVSS score: 7.8/10. Published 2016-06-13.
How severe is CVE-2016-2826?: High severity. CVSS v3 base score is 7.8 out of 10.