CVE-2020-14457

MEDIUM5.3EPSS 0.24%

Mattermost Server Sensitive Data Exposure

Published: 5/24/2022Modified: 8/14/2025

Also known as:GHSA-j2h2-cvwh-cr64BIT-mattermost-2020-14457GO-2023-1939

Description

An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the `update_team` WebSocket event, aka MMSA-2020-0012.

Affected packages (5)

Bitnami/mattermostfrom 0, < 5.20.0
Go/github.com/mattermost/mattermostfrom 0
Go/github.com/mattermost/mattermost-serverfrom 0
Go/github.com/mattermost/mattermost-server/v5from 0, < 5.20.0
Go/github.com/mattermost/mattermost-server/v5from 0, < 5.20.0

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References (6)

ADVISORYhttps://github.com/advisories/GHSA-j2h2-cvwh-cr64
ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-14457
PATCHhttps://github.com/mattermost/mattermost
WEBhttps://github.com/mattermost/mattermost/pull/13848
WEBhttps://mattermost.com/security-updates
WEBhttps://mattermost.com/security-updates/