CVE-2019-20859

HIGH

Mattermost Server <5.15.0 - Auth Bypass

Title source: llm
STIX 2.1

Description

An issue was discovered in Mattermost Server before 5.15.0. Login access control can be bypassed via crafted input.

References (1)

Core 1
Core References
Vendor Advisory x_refsource_confirm
https://mattermost.com/security-updates/

Scores

CVSS v3 7.5
EPSS 0.0032
EPSS Percentile 55.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

Status published
Products (2)
mattermost/mattermost_server 5.9.0 rc1 (4 CPE variants)
mattermost/mattermost_server < 4.10.8
Published Jun 19, 2020
Tracked Since Feb 18, 2026