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).
https://github.com/nukeviet/nukeviet/pull/2740/commits/05dfb9b4531f12944fe39556f58449b9a56241be
https://github.com/nukeviet/nukeviet/compare/4.3.03...4.3.04
https://github.com/nukeviet/nukeviet/blob/nukeviet4.3/CHANGELOG.txt
https://github.com/nukeviet/nukeviet/blob/4.3.04/CHANGELOG.txt
Source: Mitre, NVD
Published: 2020-12-31
Updated: 2026-06-17
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical
EPSS: 0.00681