CVE-2026-25013 in Phox Hosting Plugin
Summary
by MITRE • 03/25/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WHMCSdes Phox Hosting phox-host allows Reflected XSS.This issue affects Phox Hosting: from n/a through <= 2.0.8.
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Analysis
by VulDB Data Team • 03/31/2026
This vulnerability represents a classic cross-site scripting flaw that undermines the security integrity of the WHMCSdes Phox Hosting phox-host application. The issue stems from inadequate input validation and sanitization during web page generation processes, creating an avenue for malicious actors to inject arbitrary script code into web responses. The vulnerability specifically manifests as a reflected cross-site scripting attack, where malicious payloads are reflected back to users through web application responses, typically via URL parameters or form inputs. This particular weakness affects versions of the phox-host application from the initial release through version 2.0.8, indicating a persistent flaw that has not been adequately addressed in the software lifecycle.
The technical implementation of this vulnerability involves the application failing to properly neutralize user-supplied input before incorporating it into dynamically generated web content. When users submit data through various input vectors such as search fields, form parameters, or URL query strings, the application processes this information without sufficient sanitization measures. The reflected nature of the vulnerability means that the malicious script code is immediately reflected back to the user's browser through the web application's response, without being stored on the server. This characteristic makes the attack vector particularly dangerous as it requires minimal setup from the attacker and can be delivered through simple web links or email attachments.
From an operational impact perspective, this vulnerability creates significant risks for both end users and system administrators within the WHMCS environment. Attackers can exploit this weakness to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious websites, or even escalate privileges within the application. The reflected XSS nature allows for rapid deployment of attacks through social engineering techniques, where users might be tricked into clicking malicious links that contain the exploit payload. This vulnerability directly impacts the confidentiality, integrity, and availability of the hosting environment, potentially compromising sensitive customer data, billing information, and administrative access credentials.
The vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and maps to several ATT&CK techniques including T1566 for social engineering and T1059 for command and scripting interpreter usage. Organizations utilizing affected versions of phox-host should prioritize immediate remediation through input validation and output encoding mechanisms. Recommended mitigations include implementing strict input validation on all user-supplied data, employing proper output encoding for dynamic content generation, and utilizing Content Security Policy headers to limit script execution. Additionally, regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in the application's codebase, while maintaining up-to-date software versions and implementing web application firewalls as additional protective layers. The vulnerability demonstrates the critical importance of secure coding practices and input sanitization in preventing widespread exploitation of web application flaws.