Authenticated Boards File Access in Mattermost 10.11.4/10.5.12
CVE-2025-13870 Published on December 2, 2025
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
Vulnerability Analysis
CVE-2025-13870 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
Missing Authentication for Critical Function
The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Products Associated with CVE-2025-13870
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Affected Versions
Mattermost:- Version 10.11.0, <= 10.11.4 is affected.
- Version 10.5.0, <= 10.5.12 is affected.
- Version 11.1.0 is unaffected.
- Version 10.11.5 is unaffected.
- Version 10.5.13 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.