Answer in brief
CVE-2026-27964 records a Low severity (CVSS 3.9) vulnerability in FacturaScripts vulnerable to Reflected Cross-Site Scripting (XSS) via Cookie Manipulation. The current sources do not mark it as known exploited. The current feed maps facturascripts/facturascripts (composer), facturascripts/facturascripts (composer), facturascripts/facturascripts (packagist), facturascripts/facturascripts (packagist). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 3.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps facturascripts/facturascripts (composer), facturascripts/facturascripts (composer), facturascripts/facturascripts (packagist), facturascripts/facturascripts (packagist). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| facturascripts/facturascriptscomposer | >=2025.11,<2025.81 | 2025.81 |
| facturascripts/facturascriptscomposer | <2025.8 | 2025.8 |
| facturascripts/facturascriptspackagist | >=0 <2025.8 | 2025.8 |
| facturascripts/facturascriptspackagist | >=2025.11 <2025.81 | 2025.81 |
Published upstream
May 7, 2026
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Oct 30, 2026
### Summary A Reflected Cross-Site Scripting (XSS) vulnerability exists in the fsNick cookie parameter. The application reflects the cookie's value directly into the HTML without sanitization. ### Details 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. ### PoC 1. Log in to the application with any valid account. <img width="2078" height="302" alt="image" src="https://github.com/user-attachments/assets/d8a9a779-44e0-4a3e-839f-0a031868fbd5" /> 2. Capture any the GET request . <img width="1267" height="276" alt="image" src="https://github.com/user-attachments/assets/22e43f73-4f86-4cab-a074-7aba584a71ac" /> 3. Modify the value of "fsNick" with the following JavaScript: `<script>alert(window.origin)</script>` 4. Send the modified request. <img width="1569" height="319" alt="image" src="https://github.com/user-attachments/assets/ade88db1-aadc-4c50-9e02-d09888067e98" /> 5. Result <img width="1217" height="771" alt="image" src="https://github.com/user-attachments/assets/5858fe9f-127a-4845-b484-5a7ef4ae2cb4" /> ### Impact The payload executes before the session ends, which could potentially allow for a single unauthorized action before the logout.
Quoted source text, attributed separately from HOL analysis.