Description In SilverStripe through 4.6.0-rc1, a FormField with square brackets in the field name skips validation. Remediation References CVE-2020-26138 Related Vulnerabilities Moodle Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2014-3549) Apache HTTP Server Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2006-3918) WordPress Plugin Badgearoo Cross-Site Scripting (1.0.8) WordPress Plugin Qyrr-simply and modern QR-Code creation Cross-Site Scripting (0.6) WordPress Plugin WP Page Widget Cross-Site Scripting (2.7) Severity Medium Classification CVE-2020-26138 CWE-20 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Tags Missing Update Known Vulnerabilities