Stored XSS in Ultimate POS Stock Management Software

Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in Ultimate POS v7.2 and earlier versions. It allows low-privileged authenticated attackers to inject malicious HTML or script markup by setting a malicious payload in the user first-name field during account creation. When a higher-privileged user views a leave request notification for the affected user, the injected script executes in their browser session, enabling session compromise within the admin origin.

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Detection Guidance

To detect this vulnerability, inspect user accounts in Ultimate POS for suspicious first names containing HTML or script tags. Check the HRM/Leave module notifications for any rendered malicious scripts. Review server logs for unusual leave request activities or unauthorized account creations.

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Impact Analysis

Attackers with low privileges, such as Cashiers, can exploit this flaw to inject scripts that execute in the sessions of higher-privileged users like administrators. This could lead to session hijacking, unauthorized access to sensitive data, or further compromise of the application or system.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (data protection) and HIPAA (health information privacy). Organizations using affected versions may face compliance violations, data breaches, and potential legal consequences.

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Mitigation Strategies

Immediately update Ultimate POS to the latest version (7.2 or later). Sanitize all user input fields, especially the first name, to prevent XSS payloads. Restrict low-privileged users from creating accounts without admin approval. Monitor HRM/Leave module notifications for any signs of script execution.

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