CVE-2025-13870: Unauthorized access and subscription vulnerability in Boards
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
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2025-13870?
The severity of CVE-2025-13870 is classified as medium due to potential unauthorized access to sensitive information.
How do I fix CVE-2025-13870?
To fix CVE-2025-13870, upgrade your Mattermost installation to version 10.11.5 or 10.5.13 or later.
Who is affected by CVE-2025-13870?
CVE-2025-13870 affects Mattermost versions 10.11.x up to 10.11.4 and 10.5.x up to 10.5.12.
What type of vulnerability is CVE-2025-13870?
CVE-2025-13870 is a permission validation vulnerability that allows authenticated users to access unauthorized files.
Is there a workaround for CVE-2025-13870 if an upgrade is not possible?
There are no official workarounds for CVE-2025-13870, and upgrading to a secure version is strongly recommended.