What is CVE-2018-21263?

CVE-2018-21263 is a high-severity vulnerability in Mattermost Server, classified under Improper Authentication. CVSS score: 8.8/10. Published 2020-06-19.

How severe is CVE-2018-21263?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Mattermost Server

CVE-2018-21263

An issue was discovered in Mattermost Server before 4.7.0, 4.6.2, and 4.5.2. An attacker could authenticate to a different user's account via a crafted SAML response.

Vulnerability class: Broken Authentication

EPSS: 0.009 (57.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mattermost Mattermost_server — versions 4.7.0
N/a — versions n/a

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2018-21263?: CVE-2018-21263 is a high-severity vulnerability in Mattermost Server, classified under Improper Authentication. CVSS score: 8.8/10. Published 2020-06-19.
How severe is CVE-2018-21263?: High severity. CVSS v3 base score is 8.8 out of 10.