Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow the modification of local users when syncing users in shared channels. which allows a malicious remote to overwrite an existing local 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 |