What is CVE-2023-3586?

CVE-2023-3586 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 4.2/10. Published 2023-07-17.

How severe is CVE-2023-3586?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Auth bypass in Mattermost

CVE-2023-3586

Mattermost fails to disable public Boards after the "Enable Publicly-Shared Boards" configuration option is disabled, resulting in previously-shared public Boards to remain accessible.

Vulnerability class: Broken Access Control

Published 2023-07-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (18.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.3% 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

Mattermost — versions 0, 7.8.7, 7.9.5
Mattermost Server

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

mattermost.com/security-updates (Vendor Advisory)

Frequently asked questions

What is CVE-2023-3586?: CVE-2023-3586 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 4.2/10. Published 2023-07-17.
How severe is CVE-2023-3586?: Medium severity. CVSS v3 base score is 4.2 out of 10.