Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, 9.5.x <= 9.5.12 fail to properly validate the type of callProps which allows a user to cause a client side (webapp and mobile) DoS to users of particular channels, by sending a specially crafted post.
{
"versions": [
{
"introduced": "9.5.0"
},
{
"fixed": "9.5.13"
},
{
"introduced": "9.11.0"
},
{
"fixed": "9.11.5"
},
{
"introduced": "10.0.0"
},
{
"fixed": "10.0.3"
},
{
"introduced": "10.1.0"
},
{
"fixed": "10.1.3"
}
]
}