Mattermost versions 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post types, which allows attackers to deny service to users with the sysconsolereadplugins permission via creating a post with the customplnotification type and specific props.
{
"versions": [
{
"introduced": "9.11.0"
},
{
"fixed": "9.11.6"
},
{
"introduced": "10.0.0"
},
{
"fixed": "10.0.4"
},
{
"introduced": "10.1.0"
},
{
"fixed": "10.1.4"
},
{
"introduced": "10.2.0"
},
{
"fixed": "10.2.1"
}
]
}