What is CVE-2016-11076?

CVE-2016-11076 is a medium-severity vulnerability in Mattermost Server, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2020-06-19.

How severe is CVE-2016-11076?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Mattermost Server

CVE-2016-11076

An issue was discovered in Mattermost Server before 3.0.0. It does not ensure that a cookie is used over SSL.

Vulnerability class: Improper Certificate Validation

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

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000

Affected products

Mattermost Server

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

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

Frequently asked questions

What is CVE-2016-11076?: CVE-2016-11076 is a medium-severity vulnerability in Mattermost Server, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2020-06-19.
How severe is CVE-2016-11076?: Medium severity. CVSS v3 base score is 5.3 out of 10.