Mattermost versions 8.1.x before 8.1.11, 9.3.x before 9.3.3, 9.4.x before 9.4.4, and 9.5.x before 9.5.2 fail to authenticate the source of certain types of post actions, allowing an authenticated attacker to create posts as other users via a crafted post action.
Solution:
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
The product does not properly verify that the source of data or communication is valid.
Link | Tags |
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https://mattermost.com/security-updates | vendor advisory |