CVE-2026-59671 in Repasat
Summary
by MITRE • 10/02/2026
Cross-Site Scripting vulnerability in the Repasat application. Successful exploitation of this vulnerability could allow an attacker to trick a user into executing arbitrary code in the victim’s browser. The endpoint “/es/datatables/getemployeetypesdatatable” is affected.
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Analysis
by VulDB Data Team • 10/02/2026
The identified Cross-Site Scripting (XSS) vulnerability within the Repasat application represents a significant security risk that compromises the integrity and confidentiality of user data through client-side code injection. This specific flaw resides in the endpoint /es/datatables/getemployeetypesdatatable, which appears to handle requests related to employee type classifications but fails to adequately sanitize or validate input parameters before processing them for display. In typical web application architectures, such endpoints often retrieve dynamic content from a database and render it directly into HTML responses without sufficient encoding checks. When an attacker crafts a malicious payload containing executable JavaScript code and injects it via this endpoint, the server may reflect that untrusted data back to the victim's browser as part of the page response. Because the application does not implement robust output encoding or context-aware escaping mechanisms for user-supplied input in this specific route, the browser interprets the injected script as legitimate content belonging to the same origin domain.
The operational impact of successfully exploiting this vulnerability is severe, primarily because it allows an attacker to execute arbitrary JavaScript code within the security context of the victim’s browser session. This capability enables a range of malicious activities including but not limited to stealing sensitive cookies or authentication tokens, hijacking user sessions, performing actions on behalf of the authenticated user without their consent, and redirecting users to phishing sites designed to harvest credentials. Since the vulnerability affects an endpoint likely used by administrative or HR personnel managing employee data, the potential for social engineering attacks is heightened. An attacker could craft a deceptive link that appears legitimate but triggers the XSS payload when clicked by a targeted individual with elevated privileges, thereby gaining unauthorized access to sensitive organizational information such as employee personal details and payroll classifications.
From a classification perspective, this vulnerability aligns closely with CWE-79: Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting (XSS). The specific nature of the flaw suggests it is likely an instance of Reflected XSS if the malicious input is immediately returned in the HTTP response without being stored in a database. This distinction is critical for understanding the attack vector, which typically relies on social engineering to deliver the payload via URLs shared through email or other communication channels rather than persistent storage exploitation. In terms of offensive security frameworks, this vulnerability maps directly to MITRE ATT&CK technique T1059: Command and Scripting Interpreter, specifically under sub-techniques involving JavaScript execution within a browser environment. It also relates to T1204: User Execution, as the attack requires the victim to interact with a malicious link or content that triggers the script execution automatically upon page load.
To mitigate this vulnerability, immediate remediation efforts should focus on implementing strict input validation and output encoding strategies at both the application logic level and the framework configuration layer. Developers must ensure that all data retrieved from user inputs is treated as untrusted and is properly encoded before being rendered in HTML contexts. This includes using context-specific escaping techniques such as HTML entity encoding for content placed inside element bodies, attribute values, or JavaScript blocks. Additionally, implementing a Content Security Policy (CSP) header can provide an additional layer of defense by restricting the sources from which scripts are allowed to load and execute, thereby neutralizing many XSS attacks even if input sanitization fails. It is also advisable to review similar endpoints within the Repasat application for analogous flaws, as inconsistent security practices often affect multiple routes similarly. Regular automated scanning using static and dynamic analysis tools should be integrated into the development lifecycle to detect such injection points early before deployment to production environments.