CVE-2026-57715 in Fluent CRM Plugin
Summary
by MITRE • 07/13/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPManageNinja Fluent CRM fluent-crm allows Reflected XSS.This issue affects Fluent CRM: from n/a through <= 3.1.7.
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Analysis
by VulDB Data Team • 07/13/2026
This cross-site scripting vulnerability represents a critical security flaw in the WPManageNinja Fluent CRM plugin that enables attackers to inject malicious scripts into web pages viewed by other users. The vulnerability stems from improper input validation and sanitization during web page generation processes, specifically when handling user-supplied data in reflected XSS scenarios. According to CWE-79, this weakness occurs when web applications fail to properly neutralize input data before incorporating it into dynamically generated web content. The affected version range indicates that all versions up to and including 3.1.7 remain vulnerable, suggesting a persistent flaw in the plugin's data handling mechanisms.
The technical implementation of this vulnerability allows attackers to craft malicious URLs or input parameters that, when processed by the Fluent CRM application, get reflected back to users without proper sanitization. This creates an environment where attackers can execute arbitrary JavaScript code within the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of victims. The reflected nature of this XSS means that the malicious payload is immediately returned to the user by the web application, making exploitation straightforward and immediate. This vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1059.007 for command and scripting interpreter.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains where adversaries leverage the XSS to escalate privileges or gain persistent access to affected systems. Attackers could potentially steal administrator credentials, modify CRM data, or redirect users to malicious websites that appear legitimate within the context of the Fluent CRM interface. The vulnerability affects the core functionality of the plugin's web page generation capabilities, making it a high-risk exposure for any organization relying on this CRM solution. Organizations using affected versions face significant risk of unauthorized access and data compromise, particularly in environments where CRM systems contain sensitive customer information or business-critical data.
Mitigation strategies should prioritize immediate patching to version 3.1.8 or later, which presumably addresses the identified XSS vulnerability through proper input sanitization and output encoding mechanisms. Administrators should implement additional security measures including content security policies, regular security audits of web applications, and monitoring for suspicious user activities. The implementation of proper input validation frameworks aligned with OWASP Top Ten recommendations would help prevent similar vulnerabilities in future development cycles. Organizations should also consider deploying web application firewalls to provide an additional layer of protection against reflected XSS attacks while awaiting patch deployment. Regular vulnerability assessments and security training for developers can help reduce the likelihood of introducing similar flaws in other applications within the organization's technology stack.