Description A reverse proxy issue exists in FluxBB before 1.4.7 when FORUM_BEHIND_REVERSE_PROXY is enabled. Remediation References CVE-2011-3621 Related Vulnerabilities Moodle Authorization Bypass Through User-Controlled Key Vulnerability (CVE-2021-36400) PHP Address Book Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2012-1912) WordPress Plugin WPUpper Share Buttons Cross-Site Scripting (3.42) PHP Other Vulnerability (CVE-2002-2215) WordPress Plugin Chained Quiz Cross-Site Scripting (1.2.7) Severity Critical Classification CVE-2011-3621 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Tags Missing Update Known Vulnerabilities