When creating a playbook run via the /dialog API, Mattermost fails to validate all parameters, allowing an authenticated attacker to edit an arbitrary channel post.
{
"versions": [
{
"introduced": "7.7.0"
},
{
"last_affected": "7.7.3"
},
{
"introduced": "7.8.0"
},
{
"last_affected": "7.8.2"
},
{
"introduced": "7.9.0"
},
{
"last_affected": "7.9.1"
},
{
"introduced": "0"
},
{
"last_affected": "7.10.0"
}
]
}