Executive Summary

CVE-2026-7110 is a DOM-Based Cross-Site Scripting (XSS) vulnerability found in version 1.0 of an Invoice System built with Laravel. The flaw exists in the client-side JavaScript that dynamically renders invoice form items by using the innerHTML property without proper sanitization. This allows an attacker to inject malicious scripts into item names or descriptions, which then execute in the browser of any user viewing the invoice form.

The vulnerability arises because the injected HTML is parsed by the browser, triggering events such as onerror, which can run arbitrary JavaScript code. This can lead to unauthorized script execution within the application's origin context.

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Impact Analysis

This vulnerability can have several impacts including the theft of sensitive information such as CSRF tokens or session cookies, which compromises confidentiality.

It can also allow unauthorized modification of invoice form content, affecting data integrity.

Additionally, it enables arbitrary script execution within the application's origin, which can be exploited to perform various malicious actions on behalf of the user.

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Detection Guidance

This vulnerability can be detected by testing the Invoice System's item name and description fields for DOM-based Cross-Site Scripting (XSS) issues. Specifically, you can try injecting typical XSS payloads such as "><img src=x onerror=alert(document.domain)>" into these fields and then observe if the payload executes when viewing the invoice form.

To detect this on your system, you can use web application security testing tools or manual testing with browser developer tools to monitor if the injected payload triggers JavaScript execution.

There are no specific network commands provided, but you can use tools like curl or wget to send crafted HTTP requests with malicious payloads in the item name/description parameters and then check the response or behavior in the browser.

• Example manual test: Inject the payload "><img src=x onerror=alert(document.domain)>" into the item name or description field in the application UI.
• Use browser developer tools to inspect if the payload is inserted using innerHTML and if the alert or script executes.
• Use curl to send a POST request with the malicious payload in the item fields and then verify the response or test in the browser.

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Mitigation Strategies

Immediate mitigation steps involve preventing the execution of malicious scripts injected via the item name and description fields.

• Replace all uses of the `innerHTML` property with safer alternatives such as `textContent` or `innerText` to avoid parsing and executing injected HTML.
• Apply proper output encoding or escaping to all dynamic data before inserting it into the DOM.
• Use secure client-side templating engines that automatically escape content to prevent injection.

Since the vulnerability remains unpatched, these code-level mitigations are critical to reduce the risk of exploitation.

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Compliance Impact

The CVE-2026-7110 vulnerability allows for cross-site scripting (XSS) attacks that can lead to the theft of session cookies or CSRF tokens, resulting in confidentiality breaches. Such breaches can expose personal or sensitive data handled by the Invoice System.

This exposure and unauthorized access to sensitive information can negatively impact compliance with data protection regulations such as GDPR and HIPAA, which require safeguarding personal and health-related data against unauthorized access and breaches.

Additionally, the integrity of invoice data can be compromised through unauthorized modification, further violating compliance requirements for data accuracy and integrity.

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