Anyone who has view rights on the Calendar.JSONService page, including guest users can exploit this vulnerability by accessing database info or starting a DoS attack.
Remove the Calendar.JSONService page. This will however break some functionalities.
Jira issue:
If there are any questions or comments about this advisory:
{
"cwe_ids": [
"CWE-89"
],
"github_reviewed": true,
"github_reviewed_at": "2026-01-09T18:41:47Z",
"nvd_published_at": "2026-01-10T04:16:01Z",
"severity": "CRITICAL"
}