BaseFortify

Publication date: 2025-11-14

Last updated on: 2025-11-17

Assigner: Mattermost, Inc.

Description

Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2025-11-14

Last Modified

2025-11-17

Generated

2026-07-06

AI Q&A

2025-11-14

EPSS Evaluated

2026-07-05

NVD

CVE-2025-11776

EUVD

EUVD-2025-186558

Affected Vendors & Products

Vendor	Product	Version / Range
mattermost	mattermost_server	to 11.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Mattermost versions prior to 11, where the system does not properly restrict access to the archived channel search API. As a result, guest users can use the `/api/v4/teams/{team_id}/channels/search_archived` endpoint to discover archived public channels that they should not normally have access to.

Impact Analysis

The vulnerability can lead to unauthorized information disclosure, as guest users may gain access to information about archived public channels that are intended to be hidden. This could potentially expose sensitive or confidential information contained in those channels.

Hi! I’m here to help you understand CVE-2025-11776. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70