The issue resides in the Save function of admin/controller/design/template.php and involves incomplete neutralization of special elements used by OpenCart’s template engine. Improper handling of these elements exposes the system to template injection, allowing a remote attacker to influence the rendering or behavior of templates. The CVSS base score of 5.1 indicates a moderate risk profile according to the available information.

OpenCart 4.0.2.3. The vulnerable component is the admin controller template handling logic. No additional products or version ranges are listed beyond this specific release.

CVSS 5.1 reflects moderate severity, while the EPSS score of less than 1% denotes a low probability of exploitation in the near term. The vulnerability is not currently included in the CISA KEV catalog. Attack is feasible from a remote location; no known public exploits have been reported, but the potential for template injection can affect application behavior or expose sensitive data if an attacker can supply input to the template engine.