Mattermost versions 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to properly validate input when patching and duplicating a board, which allows a user to read any arbitrary file on the system via duplicating a specially crafted block in Boards.
{
"versions": [
{
"introduced": "9.11.0"
},
{
"fixed": "9.11.8"
},
{
"introduced": "10.2.0"
},
{
"fixed": "10.2.3"
},
{
"introduced": "10.3.0"
},
{
"fixed": "10.3.3"
},
{
"introduced": "10.4.0"
},
{
"fixed": "10.4.2"
}
]
}