First published: Fri Feb 09 2024(Updated: )
Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post. Fetching posts with huge amounts of reactions results in Uncontrolled Resource Consumption.
Affected Software | Affected Version | How to fix |
---|---|---|
go/github.com/mattermost/mattermost/server/v8 | >=9.1.0<9.1.5 | 9.1.5 |
go/github.com/mattermost/mattermost/server/v8 | >=9.2.0<9.2.4 | 9.2.4 |
go/github.com/mattermost/mattermost/server/v8 | <8.1.8 | 8.1.8 |
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