Mattermost version 8.1.x before 8.1.9 fails to sanitize data associated with permalinks when a plugin updates an ephemeral post, allowing an authenticated attacker who can control the ephemeral post update to access individual posts' contents in channels they are not a member of.
Solution:
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
Link | Tags |
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https://mattermost.com/security-updates | vendor advisory |