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 NextGEN Gallery-WordPress Gallery Privilege Escalation (3.2.2) phpMyAdmin Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2012-1190) WordPress Cleartext Storage of Sensitive Information Vulnerability (CVE-2017-14990) Python Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability (CVE-2016-0718) PHP-Fusion Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2020-12708) 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