CVE-2025-11776
Unknown Unknown - Not Provided
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
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Meta Information
Published
2025-11-14
Last Modified
2025-11-17
Generated
2026-06-16
AI Q&A
2025-11-14
EPSS Evaluated
2026-06-14
NVD
CVE-2025-11776
EUVD
EUVD-2025-186558
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mattermost mattermost_server to 11.0.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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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.

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