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 Jenkins Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2017-2613) Drupal Other Vulnerability (CVE-2007-0124) Oracle JRE CVE-2013-0428 Vulnerability (CVE-2013-0428) MySQL CVE-2018-2812 Vulnerability (CVE-2018-2812) WordPress Plugin WishList Member X Remote Code Execution (3.25.1) 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