CVE-2021-47769 in Isshue Shopping Cart
Summary
by MITRE • 01/15/2026
Isshue Shopping Cart 3.5 contains a persistent cross-site scripting vulnerability in title input fields across stock, customer, and invoice modules. Attackers with privileged user accounts can inject malicious scripts that execute on preview, potentially enabling session hijacking and persistent phishing attacks.
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Analysis
by VulDB Data Team • 01/26/2026
The CVE-2021-47769 vulnerability represents a critical persistent cross-site scripting flaw within the Issue Shopping Cart 3.5 application that specifically targets input fields in the stock, customer, and invoice modules. This vulnerability stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before rendering it within web pages. The flaw exists at the application layer where user inputs are directly incorporated into dynamic HTML content without proper sanitization measures, creating an attack surface that can be exploited by malicious actors with privileged access to the system.
The technical implementation of this vulnerability allows attackers to inject malicious JavaScript code through the title input fields in multiple modules of the shopping cart system. When administrators or authorized users view the affected data in preview mode, the injected scripts execute in the context of their browsers, potentially compromising their sessions and enabling unauthorized access to sensitive system resources. This persistent nature means that the malicious code remains embedded within the application's data storage and continues to execute whenever the affected content is rendered, making it particularly dangerous for long-term exploitation. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications and represents a significant weakness in the application's input validation and output encoding controls.
The operational impact of this vulnerability extends beyond simple data corruption or display issues, as it creates opportunities for session hijacking attacks that can completely compromise the security of privileged user accounts. An attacker who successfully exploits this vulnerability can potentially steal session cookies, impersonate legitimate users, and gain elevated privileges within the system. The persistent nature of the XSS attack also enables the deployment of phishing mechanisms that can target other users within the same system, as the malicious scripts will execute whenever any authorized user views the affected data. This vulnerability particularly affects the customer, stock, and invoice modules, which contain sensitive business information and user data that could be compromised through this attack vector.
Security mitigations for CVE-2021-47769 should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data processing pipeline. The most effective remediation involves sanitizing all user inputs using established libraries and frameworks that properly encode special characters before rendering content in web pages. Organizations should implement proper content security policies and ensure that all input fields, particularly those in administrative modules, undergo strict validation to prevent script injection attempts. The vulnerability also highlights the importance of following secure coding practices and adhering to OWASP Top Ten security guidelines, particularly those related to input validation and output encoding. Regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities in other parts of the application. Additionally, implementing proper access controls and privilege separation can limit the damage that can be caused by a successful exploitation, as the vulnerability requires privileged user accounts to be effective, though the impact remains significant due to the potential for session hijacking and persistent phishing attacks that can affect multiple users within the system.