Tiptap for PHP before version 2.1.1 contains an input validation vulnerability that allows authenticated attackers to cause a denial of service by submitting Tiptap JSON with the attrs.href field set to an array instead of a string, causing an unhandled TypeError in the Link::isAllowedUri() function when passed to preg_match(). Attackers can persist malformed JSON records that permanently crash the server-side HTML rendering pipeline for all subsequent viewers of that record until the database entry is manually repaired.
{
"cwe_ids": [
"CWE-241"
],
"github_reviewed": true,
"github_reviewed_at": "2026-10-07T14:01:58Z",
"nvd_published_at": "2026-06-24T22:16:47Z",
"severity": "HIGH"
}