What is CVE-2023-3582?

CVE-2023-3582 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2023-07-17.

How severe is CVE-2023-3582?

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

Auth bypass in Mattermost

CVE-2023-3582

Mattermost fails to verify channel membership when linking a board to a channel allowing a low-privileged authenticated user to link a Board to a private channel they don't have access to,

Vulnerability class: Broken Access Control

Published 2023-07-17 · 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: 0.004 (26.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Mattermost — versions 0, 7.10.3, 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-2023-3582?: CVE-2023-3582 is a medium-severity vulnerability in Mattermost, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2023-07-17.
How severe is CVE-2023-3582?: Medium severity. CVSS v3 base score is 4.3 out of 10.