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 aoringo CAT setter Cross-Site Scripting (0.1.1) SharePoint CVE-2021-40483 Vulnerability (CVE-2021-40483) PHP Out-of-bounds Write Vulnerability (CVE-2019-11043) WordPress Plugin HUSKY-Products Filter Professional for WooCommerce Multiple Vulnerabilities (1.1.4.2) WordPress Plugin Another WordPress Classifieds Unspecified Vulnerability (1.8.9.4) 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 Tags Missing Update Known Vulnerabilities