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 Store Locator for WordPress with Google Maps-LotsOfLocales Cross-Site Request Forgery (3.98.7) WordPress Plugin WooCommerce OpenPOS Arbitrary File Deletion (6.4.4) Plone CMS Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2012-5502) OpenSSL Resource Management Errors Vulnerability (CVE-2016-2179) PrestaShop URL Redirection to Untrusted Site ('Open Redirect') Vulnerability (CVE-2020-5270) 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