Mattermost fails to properly validate the length of the emoji value in the custom user status, allowing an attacker to send multiple times a very long string as an emoji value causing high resource consumption and possibly crashing the server.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "8.1.8"
},
{
"introduced": "9.0.0"
},
{
"fixed": "9.1.5"
},
{
"introduced": "9.2.0"
},
{
"fixed": "9.2.4"
}
]
}