| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 9.1.0+incompatible, < 9.1.5+incompatible≥ 9.2.0+incompatible, < 9.2.4+incompatible | 9.1.5+incompatible9.2.4+incompatible |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | ≥ 9.1.0, < 9.1.5≥ 9.2.0, < 9.2.4< 8.1.8all versions | 9.1.59.2.48.1.8 |
| mattermost server | ≥ 9.0.0, ≤ 9.1.4≥ 9.2.0, ≤ 9.2.3≤ 8.1.7 |
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.
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