CVE-2026-27964
LowCVSS 3.9Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
FacturaScripts up to version 2025.7 has a Reflected XSS vulnerability via the fsNick cookie parameter. The cookie value is reflected in HTML without sanitization, allowing script execution before redirect. Fixed in version 2025.8.
Risk Assessment
Risk of arbitrary JavaScript execution in the victim's browser, potentially leading to session theft, redirects, or data theft.
Recommendation
Update FacturaScripts to version 2025.8 or later. Implement output sanitization for all cookie-derived data.
Original NVD description (English source)
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.