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Response snapshot Oct 30, 2026, 19:11 UTC

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VulnerabilityCVE-2026-27964

FacturaScripts vulnerable to Reflected Cross-Site Scripting (XSS) via Cookie Manipulation

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. The fsNick cookie is rendered into the DOM without encoding.

At a glance

Exploited
Not known
Severity
3.9 Low (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: facturascripts/facturascripts: 2025.8; facturascripts/facturascripts: 2025.81. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-gq5c-rw37-g46c (opens a new tab)

What happened

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.

Continue reading

PoC

1. Log in to the application with any valid account.

2. Capture any the GET request .

3. Modify the value of "fsNick" with the following JavaScript: ``

4. Send the modified request.

5. Result

Impact

The payload executes before the session ends, which could potentially allow for a single unauthorized action before the logout.

Affected package ranges reported by GitHub: facturascripts/facturascripts: < 2025.8 facturascripts/facturascripts: >= 2025.11, < 2025.81

Scores and how they were measured

CVSS base severity

3.9

Version 3.1As of

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-gq5c-rw37-g46c (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-gq5c-rw37-g46c, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 30). FacturaScripts vulnerable to Reflected Cross-Site Scripting (XSS) via Cookie Manipulation (CVE-2026-27964). https://kevwire.com/record/CVE-2026-27964

MLA

"FacturaScripts vulnerable to Reflected Cross-Site Scripting (XSS) via Cookie Manipulation (CVE-2026-27964)." KEVWire, 30 Oct. 2026, kevwire.com/record/CVE-2026-27964.

Chicago

KEVWire. "FacturaScripts vulnerable to Reflected Cross-Site Scripting (XSS) via Cookie Manipulation (CVE-2026-27964)." Last modified October 30, 2026. https://kevwire.com/record/CVE-2026-27964.

Evidence summary (plain text)

FacturaScripts vulnerable to Reflected Cross-Site Scripting (XSS) via Cookie Manipulation (May 7, 2026).
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.

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.

1. Log in to the application with any valid account.

2. Capture any the GET request .

3.
CVSS 3.9 (version 3.1; evidence as of Oct 30, 2026; https://github.com/advisories/GHSA-gq5c-rw37-g46c).
Sources:
GitHub-reviewed advisory GHSA-gq5c-rw37-g46c: https://github.com/advisories/GHSA-gq5c-rw37-g46c
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-27964.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 30, 2026, 17:20 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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