CVE-2026-59660 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 “nomTransportista” parameter is affected – endpoint “/es/carriers/update”.
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Analysis
by VulDB Data Team • 10/02/2026
The identified security flaw represents a classic Cross-Site Scripting, commonly referred to as XSS, vulnerability within the Repasat application ecosystem. This specific weakness resides in the handling of user-supplied input for the nomTransportista parameter during an update operation directed at the endpoint /es/carriers/update. The fundamental nature of this defect lies in the insufficient sanitization or validation of data provided by the client before it is processed and subsequently reflected back to other users or stored within the application's database without proper encoding. When a malicious actor crafts a request containing specially constructed JavaScript code embedded within the nomTransportista field, the server accepts this input as valid due to inadequate filtering mechanisms. Consequently, when the application renders data associated with this carrier profile in subsequent HTTP responses, it inadvertently includes the injected script payload directly into the HTML content served to legitimate users' browsers.
From a technical perspective, the vulnerability exploits the browser's trust model by leveraging its execution of scripts originating from trusted domains. Because the malicious code is delivered via a response that appears to originate from the Repasat application itself, the victim’s web browser executes the script with the same privileges and permissions as any other legitimate content on the page. This allows an attacker to bypass standard security boundaries such as the Same-Origin Policy, which normally restricts how documents or scripts loaded from one origin can interact with resources from another origin. The impact is severe because it enables session hijacking, where attackers can steal authentication cookies or tokens stored in the browser's local storage or cookie jar. By extracting these credentials, an attacker can impersonate the victim within the application, gaining unauthorized access to sensitive carrier data and administrative functions without needing valid login details for that specific account.
The operational impact of this vulnerability extends beyond simple session theft. An attacker could manipulate the user interface by injecting malicious HTML elements or scripts that alter the visual presentation of the page, leading to phishing attacks where victims are tricked into entering credentials on a fake form embedded within the legitimate application layout. Furthermore, persistent XSS variants stored in the database can affect multiple users over time, turning a single input point into a widespread vector for compromise. This not only compromises the confidentiality and integrity of user data but also damages the reputation of the Repasat platform by exposing it to social engineering attacks that rely on visual deception within trusted interfaces. The specific targeting of carrier update endpoints suggests an intent to manipulate logistics or transportation records, potentially leading to broader supply chain disruptions if combined with other exploitation techniques.
To mitigate this risk, immediate remediation efforts must focus on implementing robust input validation and output encoding strategies. All data received from the nomTransportista parameter should be strictly validated against a whitelist of expected characters and formats before being processed by the backend logic. More critically, any user-controllable data that is rendered in HTML responses must undergo context-aware output encoding to ensure special characters are escaped appropriately, preventing them from being interpreted as executable code by the browser. Implementing Content Security Policy headers can also provide an additional layer of defense by restricting the sources from which scripts can be loaded and executed within the application environment. Long-term solutions should include adopting secure coding frameworks that automatically handle escaping and integrating automated static analysis tools into the development pipeline to detect such injection flaws early in the software lifecycle.
This vulnerability aligns with CWE-79, known as Improper Neutralization of Input During Web Page Generation, which categorizes failures to neutralize special characters used in web page content generation. In terms of offensive security tactics, this flaw facilitates techniques described under MITRE ATT&CK ID T1059, specifically Command and Scripting Interpretation via browser-based execution. It also supports the initial access vector associated with Spearphishing Attachment or Exploit Public-Facing Application if combined with social engineering to lure victims into clicking malicious links containing the exploit payload. Addressing this issue requires a comprehensive approach that combines technical fixes in code logic with enhanced monitoring and user awareness training to recognize suspicious activities resulting from compromised sessions.