In Mastodon 4.1.6, API endpoint rate limiting can be bypassed by setting a crafted HTTP request header.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "4.1.16"
},
{
"introduced": "4.2.0"
},
{
"last_affected": "4.2.8"
}
]
}