Description MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode). Remediation References CVE-2021-27279 Related Vulnerabilities MySQL CVE-2020-2580 Vulnerability (CVE-2020-2580) TinyMCE Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2019-1010091) PostgreSQL Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability (CVE-2021-32027) Piwigo Improper Access Control Vulnerability (CVE-2016-10105) Ruby on Rails Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') Vulnerability (CVE-2017-17917) Severity Medium Classification CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Tags Missing Update Known Vulnerabilities CWE-707 CVE-2021-27279