includes/core/is_user.php in NukeViet before 4.3.04 deserializes the untrusted nvloginhash cookie (i.e., the code relies on PHP's serialization format when JSON can be used to eliminate the risk).
{
"github_reviewed": true,
"github_reviewed_at": "2021-04-07T22:08:23Z",
"cwe_ids": [
"CWE-502"
],
"nvd_published_at": "2020-12-31T05:15:00Z",
"severity": "CRITICAL"
}