Mattermost versions 9.11.x <= 9.11.0 and 9.5.x <= 9.5.8 fail to validate that the message of the permalink post is a string, which allows an attacker to send a non-string value as the message of a permalink post and crash the frontend.
Solution:
The product does not properly control the allocation and maintenance of a limited resource.
Link | Tags |
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https://mattermost.com/security-updates | vendor advisory |