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 WordPress Plugin Ultimate Instagram Feed Cross-Site Scripting (1.2) Oracle JRE CVE-2012-1726 Vulnerability (CVE-2012-1726) WordPress 5.4 Multiple Vulnerabilities (5.4) Jboss EAP Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') Vulnerability (CVE-2017-2595) PostgreSQL CVE-2023-5870 Vulnerability (CVE-2023-5870) 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