Description
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 and to crash the server due to overloading when clients attempt to retrive the aforementioned post.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mattermost Mattermost
Default version status: unaffected
0 to ≤ 8.1.7affected0 to ≤ 9.1.4affected0 to ≤ 9.2.3affected9.3.0unaffected9.2.4unaffected9.1.5unaffected8.1.8unaffected