What is CVE-2018-18819?

CVE-2018-18819 is a medium-severity vulnerability in Mitel Micollab, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2019-11-12.

How severe is CVE-2018-18819?

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

Auth bypass in Mitel Micollab

CVE-2018-18819

A vulnerability in the web conference chat component of MiCollab, versions 7.3 PR6 (7.3.0.601) and earlier, and 8.0 (8.0.0.40) through 8.0 SP2 FP2 (8.0.2.202), and MiVoice Business Express versions 7.3 PR3 (7.3.1.302) and earlier, and 8.0 (8.0.0.40) through 8.0 SP2 FP1 (8.0.2.202), could allow creation of unauthorized chat sessions, due to insufficient access controls. A successful exploit could allow execution of arbitrary commands.

Vulnerability class: Broken Access Control

Published 2019-11-12 · 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:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (73.0th percentile), scored 2026-11-01.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

www.mitel.com/support/security-advisories (Vendor Advisory)
www.mitel.com/support/security-advisories/mitel-product-security-advisory-18-00… (Vendor Advisory)

Frequently asked questions

What is CVE-2018-18819?: CVE-2018-18819 is a medium-severity vulnerability in Mitel Micollab, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2019-11-12.
How severe is CVE-2018-18819?: Medium severity. CVSS v3 base score is 5.3 out of 10.