Improper sanitization in the registration module allows reflected Cross-Site Scripting.

{
                    "defaultStatus": "unaffected",
                    "vendor": "phpBB",
                    "product": "phpBB",
                    "versions": [
                        {
                            "version": "3.3.0",
                            "status": "affected",
                            "lessThanOrEqual": "3.3.18",
                            "versionType": "semver"
                        }
                    ]
                }