Description Cross-site Scripting vulnerability in MyBB before 1.8.26 via Custom moderator tools. Remediation References CVE-2021-27949 Related Vulnerabilities WordPress Plugin Ajax Contact Form Cross-Site Scripting (1.0) Oracle JRE CVE-2013-0424 Vulnerability (CVE-2013-0424) Liferay Portal Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2025-43783) Moodle Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') Vulnerability (CVE-2016-5013) LimeSurvey Improper Restriction of Rendered UI Layers or Frames Vulnerability (CVE-2019-16175) Severity Medium Classification CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Tags Missing Update Known Vulnerabilities CWE-707 CVE-2021-27949