Mattermost versions 9.6.0, 9.5.x before 9.5.3, and 8.1.x before 8.1.12 fail to fully validate role changes which allows an attacker authenticated as team admin to demote users to guest via crafted HTTP requests.
Solution:
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
Link | Tags |
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https://mattermost.com/security-updates | vendor advisory |