Description MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode). Remediation References CVE-2021-27279 Related Vulnerabilities WordPress Plugin HTML5 Lyrics Karaoke Player Cross-Site Scripting (1.06) Drupal Core 4.7.x Denial of Service (4.7.0 - 4.7.4) WordPress Plugin Migration, Backup, Staging-WPvivid Directory Traversal (0.9.75) Nginx Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') Vulnerability (CVE-2009-3898) Oracle Database Server CVE-2009-1985 Vulnerability (CVE-2009-1985) Severity Medium Classification CVE-2021-27279 CWE-707 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Tags Missing Update Known Vulnerabilities