CVE-2025-13870
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-02

Last updated on: 2025-12-03

Assigner: Mattermost, Inc.

Description
Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to
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Meta Information
Published
2025-12-02
Last Modified
2025-12-03
Generated
2026-06-16
AI Q&A
2025-12-02
EPSS Evaluated
2026-06-15
NVD
CVE-2025-13870
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mattermost mattermost_server From 10.5.0 (inc) to 10.5.13 (exc)
mattermost mattermost_server From 10.11.0 (inc) to 10.11.5 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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Executive Summary

This vulnerability in Mattermost versions 10.11.x <= 10.11.4 and 10.5.x <= 10.5.12 occurs because the software fails to properly validate user permissions when accessing files and subscribing to blocks in Boards. As a result, an authenticated user can access files and subscribe to blocks from other boards that they do not have permission to access.

Impact Analysis

The impact of this vulnerability is that an authenticated user could gain unauthorized access to files and board blocks they should not have access to, potentially leading to information disclosure or unauthorized data access within the Mattermost Boards feature.

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