Client-Side code injection through Mermaid markup in GitLab CE/EE 12.9 and later through 13.0.1 allows a specially crafted Mermaid payload to PUT requests on behalf of other users via clicking on a link
{
"versions": [
{
"introduced": "12.9.0"
},
{
"fixed": "12.9.8"
},
{
"introduced": "12.9.0"
},
{
"fixed": "12.9.8"
},
{
"introduced": "12.10.0"
},
{
"fixed": "12.10.7"
},
{
"introduced": "12.10.0"
},
{
"fixed": "12.10.7"
},
{
"introduced": "0"
},
{
"last_affected": "13.0.0"
},
{
"introduced": "0"
},
{
"last_affected": "13.0.0"
}
]
}