Description Contao >=4.0.0 allows backend XSS via HTML attributes to an HTML field. Fixed in 4.4.56, 4.9.18, 4.11.7. Remediation References CVE-2021-35955 Related Vulnerabilities WordPress Plugin Magic Fields 2 Cross-Site Scripting (2.3.2.4) WordPress Plugin WP Review Slider SQL Injection (10.9) Moodle Incorrect Authorization Vulnerability (CVE-2021-40692) WordPress Plugin WordPress+Microsoft Office 365/Azure AD-LOGIN Cross-Site Scripting (15.3) WordPress Plugin Dokan-Best WooCommerce Multivendor Marketplace Solution-Build Your Own Amazon, eBay, Etsy Security Bypass (2.9.4) Severity Medium Classification CVE-2021-35955 CWE-707 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N Tags Missing Update Known Vulnerabilities