Description Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages. Remediation References CVE-2021-27889 Related Vulnerabilities Drupal Cross-Site Request Forgery (CSRF) Vulnerability (CVE-2008-3221) SharePoint Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2018-8156) WordPress Plugin Custom Admin Page by BestWebSoft Cross-Site Scripting (0.1.1) WordPress Plugin Custom Login Page Customizer-LoginPress Unspecified Vulnerability (1.1.15) PHP Other Vulnerability (CVE-2006-1015) Severity Medium Classification CVE-2021-27889 CWE-707 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Tags Missing Update Known Vulnerabilities