Description Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages. Remediation References CVE-2021-27889 Related Vulnerabilities phpMyAdmin Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') Vulnerability (CVE-2011-2643) Ruby Improper Input Validation Vulnerability (CVE-2009-4492) WordPress Plugin Events Made Easy PHP Object Injection (2.0.52) WordPress Plugin Responsive Menu-Create Mobile-Friendly Menu Multiple Vulnerabilities (4.0.3) PostgreSQL Missing Encryption of Sensitive Data Vulnerability (CVE-2017-7485) Severity Medium Classification CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Tags Missing Update Known Vulnerabilities CWE-707 CVE-2021-27889