CVE-2026-30568 identifies a reflected Cross-Site Scripting (XSS) vulnerability in SourceCodester Inventory System version 1.0, located in the view_purchase.php script via the 'limit' parameter. The vulnerability occurs because the application fails to sanitize or encode the input received through this parameter, allowing an attacker to inject arbitrary HTML or JavaScript code. When a victim accesses a crafted URL containing malicious payloads in the 'limit' parameter, the injected script executes in the victim's browser context. This can lead to various attacks such as session hijacking, theft of cookies or credentials, defacement, or redirection to phishing or malware sites. Reflected XSS requires the victim to interact with a malicious link, often delivered via phishing or social engineering. The vulnerability is client-side and does not directly compromise server integrity but can be leveraged to escalate attacks against users. No CVSS score is assigned yet, and no patches or known exploits have been reported. The affected software is an inventory management system, which may be deployed in small to medium enterprises managing stock and purchase data. The lack of input validation on the 'limit' parameter indicates a coding oversight that should be addressed by proper sanitization and output encoding to prevent script injection.

The primary impact of this vulnerability is on the confidentiality and integrity of user sessions and data accessed through the affected web application. Attackers exploiting this reflected XSS can steal session cookies, enabling account takeover, or perform actions on behalf of the user. Additionally, users may be redirected to malicious websites, increasing the risk of further compromise or malware infection. Although the vulnerability does not directly affect server availability or integrity, successful exploitation can undermine user trust and lead to data breaches. Organizations using the SourceCodester Inventory System may face reputational damage, regulatory penalties if user data is compromised, and operational disruptions if attackers leverage the vulnerability for broader attacks. Since the vulnerability requires user interaction, the scope is limited to users who access maliciously crafted URLs, but phishing campaigns could increase exposure. The absence of known exploits suggests a window of opportunity for remediation before widespread abuse.

To mitigate CVE-2026-30568, organizations should immediately implement input validation and output encoding on the 'limit' parameter within the view_purchase.php file. Specifically, all user-supplied input must be sanitized to remove or encode special characters that could be interpreted as executable code. Employing a whitelist approach for acceptable input values (e.g., numeric limits only) is recommended. Additionally, use security headers such as Content Security Policy (CSP) to restrict script execution and reduce the impact of potential XSS attacks. Educate users to be cautious about clicking on suspicious links, especially those received via email or untrusted sources. Monitoring web application logs for unusual URL patterns can help detect attempted exploitation. If possible, upgrade to a patched version once available or apply vendor-provided fixes. Conduct regular security assessments and code reviews to identify and remediate similar input validation issues. Finally, consider implementing web application firewalls (WAFs) with rules designed to detect and block reflected XSS payloads targeting this parameter.