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 Cashtomer SQL Injection (1.0.0) WordPress Plugin Download Manager Arbitrary File Deletion (3.2.50) WordPress Plugin WP Socializer-Simple & Easy Social Media Share Icons Cross-Site Scripting (7.2) Moodle Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2009-0500) MySQL CVE-2021-35632 Vulnerability (CVE-2021-35632) 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