CVE-2026-66467 in FluentCommunity Plugin
Summary
by MITRE • 08/13/2026
Subscriber Cross Site Scripting (XSS) in FluentCommunity <= 2.7.5 versions.
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Analysis
by VulDB Data Team • 08/13/2026
FluentCommunity is a WordPress plugin designed to create community platforms with features like forums, groups, and member management systems. The plugin has been widely adopted by organizations seeking to build interactive online communities. However, a critical cross site scripting vulnerability has been identified in versions up to and including 2.7.5, which poses significant security risks to users of this platform.
The vulnerability stems from insufficient input validation and output sanitization within the plugin's handling of user-submitted data. Specifically, when users create posts, comments, or other content within the community platform, the plugin fails to properly sanitize or escape special characters in user inputs before rendering them on web pages. This allows malicious actors to inject malicious scripts that execute in the context of other users' browsers. The flaw exists primarily in the plugin's forum and discussion board components where user-generated content is displayed without adequate security measures.
The operational impact of this vulnerability is substantial as it enables attackers to perform various malicious activities including session hijacking, credential theft, data exfiltration, and manipulation of community content. An attacker could inject scripts that steal cookies or authentication tokens from logged-in users, potentially gaining unauthorized access to user accounts and community administrative functions. The vulnerability affects all users who interact with the community platform, particularly administrators and moderators who may be targeted for privilege escalation attacks.
This vulnerability maps directly to CWE-79 which defines cross site scripting as a weakness where untrusted data is sent to a web browser without proper validation or escaping. The flaw also aligns with ATT&CK technique T1566 which covers social engineering through spearphishing, as attackers could exploit this vulnerability to deliver malicious payloads to unsuspecting users. The attack surface expands significantly when considering that many community platforms store sensitive personal information and may handle confidential discussions.
Mitigation strategies should begin with immediate patching of the plugin to version 2.7.6 or later where the XSS vulnerability has been addressed through proper input sanitization and output escaping mechanisms. Administrators should also implement additional security measures such as content security policies, regular security audits of user-generated content, and monitoring for suspicious activity patterns. Network-level protections like web application firewalls can provide additional layers of defense while input validation rules should be strengthened to prevent similar issues in future development cycles. User education regarding the risks of clicking on untrusted links within community platforms remains essential for comprehensive security posture maintenance.