CVE-2026-66673 is an unauthenticated Cross Site Scripting (XSS) vulnerability affecting Flatastic versions up to 2.0. The vulnerability allows remote attackers to inject malicious scripts without requiring authentication. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality, integrity, and availability. No patch or official remediation details are provided in the available data.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of users visiting the affected Flatastic application, potentially leading to information disclosure, session hijacking, or other client-side impacts. The vulnerability is exploitable remotely without authentication, increasing its risk. However, no known exploits are reported in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider applying web application firewalls or input validation controls to mitigate potential exploitation. Monitor vendor channels for updates.