Mattermost 10-11 <=10.12.1: Auth. editor can delete others' Boards comments
CVE-2025-12756 Published on December 1, 2025
Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.
Vulnerability Analysis
CVE-2025-12756 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2025-12756 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-12756
Want to know whenever a new CVE is published for MatterMost? stack.watch will email you.
Affected Versions
Mattermost:- Version 11.0.0, <= 11.0.2 is affected.
- Version 10.12.0, <= 10.12.1 is affected.
- 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 11.0.3 is unaffected.
- Version 10.12.2 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.