What is CVE-2016-3379?

CVE-2016-3379 is a medium-severity vulnerability in Microsoft Exchange Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2016-09-14.

How severe is CVE-2016-3379?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Microsoft Exchange Server

CVE-2016-3379

Cross-site scripting (XSS) vulnerability in Microsoft Exchange Server 2016 Cumulative Update 1 and 2 allows remote attackers to inject arbitrary web script or HTML via a meeting-invitation request, aka "Microsoft Exchange Elevation of Privilege Vulnerability."

Vulnerability class: XSS (Cross-Site Scripting)

Published 2016-09-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.082 (94.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.082 · newest: 0.082 · change: 0.000

Affected products

Microsoft Exchange Server — versions 2016

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-108 (vendor-advisory)
www.securitytracker.com/id/1036778 (vdb-entry)
www.securityfocus.com/bid/92836 (vdb-entry)

Frequently asked questions

What is CVE-2016-3379?: CVE-2016-3379 is a medium-severity vulnerability in Microsoft Exchange Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2016-09-14.
How severe is CVE-2016-3379?: Medium severity. CVSS v3 base score is 6.1 out of 10.