In Firebase PHP-JWT before 6.0.0, an algorithm-confusion issue (e.g., RS256 / HS256) exists via the kid (aka Key ID) header, when multiple types of keys are loaded in a key ring. This allows an attacker to forge tokens that validate under the incorrect key. NOTE: this provides a straightforward way to use the PHP-JWT library unsafely, but might not be considered a vulnerability in the library itself.
{
"github_reviewed": true,
"cwe_ids": [
"CWE-347",
"CWE-843"
],
"github_reviewed_at": "2023-02-17T14:26:38Z",
"nvd_published_at": "2022-03-29T07:15:00Z",
"severity": "CRITICAL"
}