Vert.x-Web framework v4.0 milestone 1-4 does not perform a correct CSRF verification. Instead of comparing the CSRF token in the request with the CSRF token in the cookie, it compares the CSRF token in the cookie against a CSRF token that is stored in the session. An attacker does not even need to provide a CSRF token in the request because the framework does not consider it. The cookies are automatically sent by the browser and the verification will always succeed, leading to a successful CSRF attack.
{
"github_reviewed": true,
"github_reviewed_at": "2021-04-20T17:07:06Z",
"nvd_published_at": "2021-01-20T13:15:00Z",
"severity": "HIGH",
"cwe_ids": [
"CWE-352"
]
}