What is CVE-2018-21251?

CVE-2018-21251 is a critical-severity vulnerability in Mattermost Mattermost_server, classified under Missing Authorization. CVSS score: 9.8/10. Published 2020-06-19.

How severe is CVE-2018-21251?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Mattermost Mattermost_server

CVE-2018-21251

An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.

Vulnerability class: Broken Access Control

EPSS: 0.012 (64.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mattermost Mattermost_server — versions 5.2.0
N/a — versions n/a

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2018-21251?: CVE-2018-21251 is a critical-severity vulnerability in Mattermost Mattermost_server, classified under Missing Authorization. CVSS score: 9.8/10. Published 2020-06-19.
How severe is CVE-2018-21251?: Critical severity. CVSS v3 base score is 9.8 out of 10.