GHSA-gq5c-rw37-g46c is a low-severity (CVSS 3.9) Cross-site Scripting (XSS) vulnerability in facturascripts/facturascripts. No vendor fix is recorded yet; mitigation options are listed below.
FacturaScripts vulnerable to Reflected Cross-Site Scripting (XSS) via Cookie Manipulation
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for GHSA-gq5c-rw37-g46c.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-gq5c-rw37-g46c plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,333 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
facturascripts/facturascriptsReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
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
-
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" /> -
Capture any the GET request .
<img width="1267" height="276" alt="image" src="https://github.com/user-attachments/assets/22e43f73-4f86-4cab-a074-7aba584a71ac" /> -
Modify the value of "fsNick" with the following JavaScript:
<script>alert(window.origin)</script> -
Send the modified request.
<img width="1569" height="319" alt="image" src="https://github.com/user-attachments/assets/ade88db1-aadc-4c50-9e02-d09888067e98" /> -
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | facturascripts/facturascripts | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for facturascripts/facturascripts, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of facturascripts/facturascripts has shipped for GHSA-gq5c-rw37-g46c yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-gq5c-rw37-g46c can be triaged on real exposure rather than presence alone.
Tailored to GHSA-gq5c-rw37-g46c. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-gq5c-rw37-g46c in your dependencies?
O3 Security finds GHSA-gq5c-rw37-g46c across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.