BaseFortify

Publication date: 2025-10-16

Last updated on: 2025-10-21

Assigner: Mattermost, Inc.

Description

Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the RelayState

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-10-16

Last Modified

2025-10-21

Generated

2026-07-06

AI Q&A

2025-10-16

EPSS Evaluated

2026-07-05

NVD

CVE-2025-58075

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost_server	From 10.5.0 (inc) to 10.5.11 (exc)
mattermost	mattermost_server	From 10.10.0 (inc) to 10.10.3 (exc)
mattermost	mattermost_server	From 10.11.0 (inc) to 10.11.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability exists in certain versions of Mattermost where the system fails to verify if a user has permission to join a team when using the original invite token. This flaw allows an attacker to manipulate the RelayState parameter to join any team on a Mattermost server regardless of the intended access restrictions.

Impact Analysis

An attacker exploiting this vulnerability can gain unauthorized access to any team on a Mattermost server, potentially exposing sensitive information and communications within those teams. This can lead to confidentiality breaches and unauthorized information disclosure.

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