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 Tutor LMS-eLearning and online course solution Cross-Site Scripting (1.9.14) qdPM Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2020-18468) Drupal Core 8.x.x Cross-Site Request Forgery (8.0.0 - 8.7.14) Joomla Other Vulnerability (CVE-2007-0374) WordPress Plugin Insert Pages Cross-Site Scripting (3.7.4) 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 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N Tags Missing Update Known Vulnerabilities