CVE-2026-27964: NeoRazorX FacturaScripts reflected XSS in fsNick cookie

CVE-2026-27964 · Severity: low · CVSS 3.9 · Published 2026-05-18

FacturaScripts, an open-source ERP and accounting system, is vulnerable to a security flaw where user-controlled data in a browser cookie is displayed back to the user without proper safety checks. An attacker who can manipulate a user's cookies could execute malicious scripts in the victim's browser session. While the system attempts to log the user out when it detects the manipulation, the malicious script can still run briefly, potentially allowing for unauthorized actions or data theft before the session ends.

Technologies: NeoRazorX FacturaScripts, facturascripts/facturascripts (Packagist). Vendors: NeoRazorX, Packagist.

Quick answers

Is CVE-2026-27964 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-27964 being exploited in the wild.
How severe is CVE-2026-27964?
Low severity, with a CVSS score of 3.9, published 18 May 2026.
Which products and versions are affected?
NeoRazorX FacturaScripts <= 2025.7, <= 2025.71; facturascripts/facturascripts (Packagist) <= 2025.71, ECOSYSTEM:introduced=0,last_affected=2025.71.
Is there a fix for CVE-2026-27964?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-27964 attacked?
It is attacked with local access, in a network appliance.
Am I affected by CVE-2026-27964?
Check whether you run NeoRazorX FacturaScripts or facturascripts/facturascripts (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Reflected Cross-Site Scripting (XSS) vulnerability exists in FacturaScripts versions up to 2025.71. The application reflects the value of the 'fsNick' cookie directly into the DOM without proper sanitization or encoding. Although the server-side logic identifies the modified session and triggers a logout redirect, the malicious payload is rendered in the HTML and executed by the browser before the redirect is processed. An attacker with the ability to manipulate cookies (e.g., via local access or other web vulnerabilities) can execute arbitrary JavaScript in the context of the user's session. A fix is available in the project's source repository.

Affected products

  • NeoRazorX FacturaScripts <= 2025.71

Identifiers

  • CVE-2026-27964
  • GHSA-gq5c-rw37-g46c

Timeline

  • 2026-05-07: disclosed
  • 2026-05-07: advisory
  • 2026-05-18: other: NVD published

References

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