Mattermost versions 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 fail to enforce proper access controls which allows any authenticated user, including guests, to mark any channel inside any team as read for any user.
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 |