CVE-2018-6845 in Multi Language Olx Clone Script
Summary
by MITRE
PHP Scripts Mall Multi Language Olx Clone Script 2.0.6 has XSS via the Leave Comment field.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 07/27/2025
The vulnerability identified as CVE-2018-6845 affects the PHP Scripts Mall Multi Language Olx Clone Script version 2.0.6, representing a cross-site scripting weakness that poses significant security risks to users of this classified advertising platform. This particular implementation flaw resides within the comment submission functionality, where user input is not properly sanitized or validated before being rendered back to other users. The vulnerability allows malicious actors to inject arbitrary JavaScript code through the Leave Comment field, which then executes in the browsers of other users who view the affected content.
The technical nature of this vulnerability aligns with CWE-79, which categorizes cross-site scripting as a code injection flaw where untrusted data is embedded into web pages viewed by other users. This specific instance demonstrates a classic reflected XSS vulnerability where user-supplied data flows directly from input to output without adequate sanitization or encoding. The attack vector is particularly concerning as it targets the comment functionality, which is a core user interaction feature in online classified platforms where users frequently submit content. When users leave comments on listings, the platform displays these comments to other visitors, making this a prime location for persistent XSS attacks that can compromise multiple users simultaneously.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can enable attackers to hijack user sessions, steal sensitive information, or redirect users to malicious websites. In the context of an Olx clone platform, where users may be sharing personal contact information or sensitive listing details, the potential for abuse is substantial. Attackers could exploit this vulnerability to execute malicious scripts that capture user credentials, modify displayed content to appear legitimate, or even redirect users to phishing sites that mimic the platform's interface. The vulnerability's persistence is particularly dangerous as comments are typically stored and displayed repeatedly, meaning a single malicious comment can affect numerous users over extended periods.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and output encoding mechanisms throughout the application's comment handling system. The primary defense involves sanitizing all user input before processing and ensuring that any content rendered to users is properly encoded to prevent script execution. This includes implementing Content Security Policy headers to limit script execution, employing proper HTML encoding for user-generated content, and validating input length and character sets. The solution should also incorporate automated testing procedures including dynamic application security testing and manual penetration testing to identify similar vulnerabilities in other input fields. Organizations should also consider implementing web application firewalls and regular security audits to maintain protection against evolving XSS attack techniques. The vulnerability serves as a reminder of the critical importance of input validation in web applications and aligns with ATT&CK technique T1203, which covers exploitation of web application vulnerabilities for privilege escalation and data exfiltration purposes.