Mattermost fails to deduplicate input IDs allowing a simple user to cause the application to consume excessive resources and possibly crash by sending a specially crafted request to /api/v4/users/ids with multiple identical IDs.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "7.8.11"
},
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.3"
},
{
"introduced": "8.1.0"
},
{
"fixed": "8.1.2"
}
]
}