Mattermost versions 9.5.x <= 9.5.3, 9.7.x <= 9.7.1, 9.6.x <= 9.6.1, 8.1.x <= 8.1.12 fail to enforce proper access control which allows a user to run a slash command in a channel they are not a member of via linking a playbook run to that channel and running a slash command as a playbook task command.
{
"versions": [
{
"introduced": "8.1.0"
},
{
"fixed": "8.1.13"
},
{
"introduced": "9.5.0"
},
{
"fixed": "9.5.4"
},
{
"introduced": "9.6.0"
},
{
"fixed": "9.6.2"
},
{
"introduced": "9.7.0"
},
{
"fixed": "9.7.2"
}
]
}