3.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-27964

CVE-2026-27964: FacturaScripts: Reflected Cross-Site Scripting (XSS) via Cookie Manipulation

FacturaScripts is an open source accounting and invoicing software. Versions 2025.7 and prior contain a Reflected Cross-Site Scripting (XSS) vulnerability through the fsNick cookie parameter. The application reflects the cookie's value directly into the HTML without sanitization. The fsNick cookie is rendered into the DOM without encoding. While the server does reject the modified session and forces a logout, the HTML containing the payload reaches the browser first. This lets the script execute immediately upon load, effectively beating the redirect. This issue has been fixed in version 2025.8.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-27964

CVE-2026-27964:

3.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
facturascripts/facturascripts	composer	<= 2025.71

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a classic reflected XSS. The application uses the fsNick cookie to store the user's nickname and displays it on the page. The getNick function in the User model retrieves the cookie's value without any sanitization. An attacker can modify the fsNick cookie to include a malicious script. When the application reads the cookie and displays the nickname, the script is executed in the user's browser. The vulnerable function is FacturaScripts\Core\Model\User::getNick because it is responsible for retrieving the unsanitized cookie value. This value is then used in the Admin.php controller, which passes it to the view, where it is rendered, triggering the XSS.

Vulnerable functions

FacturaScripts\Core\Model\User::getNick

Core/Model/User.php

The `getNick` function directly returns the value of the `fsNick` cookie without any sanitization. This allows an attacker to inject malicious scripts into the cookie, which will then be executed when the application renders the user's nickname.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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