What is CVE-2016-11065?

CVE-2016-11065 is a medium-severity vulnerability in Mattermost Server, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.3/10. Published 2020-06-19.

How severe is CVE-2016-11065?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Mattermost Server

CVE-2016-11065

An issue was discovered in Mattermost Server before 3.3.0. An attacker could use the WebSocket feature to send pop-up messages to users or change a post's appearance.

Published 2020-06-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Mattermost Server

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

mattermost.com/security-updates/ (Vendor Advisory)

Frequently asked questions

What is CVE-2016-11065?: CVE-2016-11065 is a medium-severity vulnerability in Mattermost Server, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.3/10. Published 2020-06-19.
How severe is CVE-2016-11065?: Medium severity. CVSS v3 base score is 4.3 out of 10.