Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing
{
"versions": [
{
"introduced": "9.11.0"
},
{
"fixed": "9.11.18"
},
{
"introduced": "10.5.0"
},
{
"fixed": "10.5.9"
},
{
"introduced": "10.8.0"
},
{
"fixed": "10.8.4"
},
{
"introduced": "10.9.0"
},
{
"fixed": "10.9.4"
},
{
"introduced": "10.10.0"
},
{
"fixed": "10.10.2"
}
]
}