CVE-2024-27991 in SupportCandy Plugin
Summary
by MITRE • 04/11/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in SupportCandy allows Stored XSS.This issue affects SupportCandy: from n/a through 3.2.3.
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Analysis
by VulDB Data Team • 04/13/2025
The vulnerability identified as CVE-2024-27991 represents a critical cross-site scripting weakness in the SupportCandy web application platform that enables stored XSS attacks. This flaw exists within the web page generation process where input validation and sanitization mechanisms fail to properly neutralize malicious user inputs before they are rendered in web pages. The vulnerability affects all versions of SupportCandy from the initial release through version 3.2.3, indicating a persistent issue that has remained unaddressed for an extended period. The stored nature of this XSS vulnerability means that malicious scripts can be permanently injected into the application's database and subsequently executed whenever affected pages are loaded by other users, making it particularly dangerous for environments where multiple users interact with shared data.
This vulnerability falls under the CWE-79 category of Cross-site Scripting, specifically manifesting as a stored XSS variant that operates outside the typical scope of reflected or DOM-based attacks. The technical flaw occurs during the web page generation phase where user-supplied data flows directly into HTML output without adequate sanitization or encoding mechanisms. When SupportCandy processes user inputs for display in web interfaces, the application fails to implement proper input validation that would prevent malicious scripts from being stored and subsequently executed in the context of other users' browsers. The vulnerability likely stems from insufficient escaping of user-controllable data when it is rendered in HTML contexts, allowing attackers to inject script code that executes in the victim's browser session.
The operational impact of this vulnerability is severe and multifaceted, as it provides attackers with persistent access to user sessions and potentially sensitive data within the SupportCandy environment. An attacker who successfully exploits this vulnerability can execute arbitrary JavaScript code in the context of authenticated users' browsers, enabling session hijacking, credential theft, data exfiltration, and privilege escalation attacks. The stored nature of the vulnerability means that malicious payloads can persist indefinitely within the application's database, affecting all users who view the compromised content. This makes the vulnerability particularly dangerous in multi-user environments where administrators and regular users may be exposed to the same malicious content, potentially leading to widespread compromise of the entire SupportCandy instance.
Organizations utilizing SupportCandy versions affected by CVE-2024-27991 should immediately implement mitigations including upgrading to the latest available version that addresses this vulnerability, implementing web application firewalls with XSS detection capabilities, and deploying content security policies to limit script execution. The remediation strategy should include comprehensive input validation and output encoding mechanisms to prevent malicious code from being stored or executed. Security teams should also conduct thorough audits of all user inputs and implement proper sanitization routines that escape special characters and validate data formats before storage. Additionally, regular security testing including penetration testing and automated vulnerability scanning should be conducted to identify similar weaknesses in the application's codebase. This vulnerability aligns with ATT&CK technique T1566.001 for initial access through malicious web content and T1071.001 for application layer protocol usage, making it a critical target for both defensive and offensive security operations.