CVE-2017-18920

CRITICAL

Mattermost Server < 3.6.2 - Same Origin Policy Bypass via WebSocket Feature

Title source: llm
STIX 2.1

Description

An issue was discovered in Mattermost Server before 3.6.2. The WebSocket feature does not follow the Same Origin Policy.

References (1)

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

Scores

CVSS v3 9.8
EPSS 0.0050
EPSS Percentile 66.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

Status published
Products (1)
mattermost/mattermost_server < 3.6.2
Published Jun 19, 2020
Tracked Since Feb 18, 2026