BaseFortify

Publication date: 2025-10-16

Last updated on: 2025-10-29

Assigner: Mattermost, Inc.

Description

Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-10-16

Last Modified

2025-10-29

Generated

2026-07-06

AI Q&A

2025-10-16

EPSS Evaluated

2026-07-05

NVD

CVE-2025-41443

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost_server	From 10.5.0 (inc) to 10.5.11 (exc)
mattermost	mattermost_server	From 10.11.0 (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 Mattermost versions 10.5.x up to 10.5.10 and 10.11.x up to 10.11.2, where guest user permissions are not properly validated when accessing channel information. This flaw allows guest users to discover active public channels and their metadata by using the /api/v4/teams/{team_id}/channels/ids endpoint.

Impact Analysis

The vulnerability can impact you by allowing guest users to gain unauthorized visibility into active public channels and their metadata, potentially exposing information that should not be accessible to guests. This could lead to information disclosure risks within your Mattermost environment.

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