FacturaScripts vulnerable to stored XSS via product reference in sales/purchases

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-42877: 0.19% estimated exploitation activity in the next 30 days; percentile 9.20 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A stored Cross-Site Scripting (XSS) vulnerability exists in the product search modal of sales and purchases documents. An authenticated user with access to the warehouse module can create a product with a malicious reference that executes arbitrary JavaScript in the browser of any other user who opens the product search modal inside an invoice, order, or delivery note. Affected files - Core/Lib/AjaxForms/SalesModalHTML.php - Core/Lib/AjaxForms/PurchasesModalHTML.php Vulnerability details The referencia field of a product variant is injected directly into an HTML onclick attribute string without JavaScript context escaping: When a product is saved, noHtml() encodes ' → '. This appears safe in static HTML context. However, the modal HTML is later returned as a JSON response and inserted into the DOM via innerHTML: The browser HTML parser decodes ' → ' during the innerHTML assignment, breaking out of the JavaScript string literal in the onclick attribute and executing…

Published by the source

7 May 2026, 19:37 UTC

Last modified by the source

8 Jun 2026, 23:53 UTC

Source last checked

26 Oct 2026, 14:48 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-r736-2678-fcrx

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# Patch Next advisory brief: CVE-2026-42877

Advisory: FacturaScripts vulnerable to stored XSS via product reference in sales/purchases
IDs: CVE-2026-42877, GHSA-r736-2678-fcrx
Record: https://patchnext.com/advisories/cve-2026-42877 (revision 1, source checked 26 Oct 2026, 14:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist facturascripts/facturascripts: affected <= 2025.92

## Suggested inspection (read-only)
- Packagist facturascripts/facturascripts: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on facturascripts/facturascripts.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-r736-2678-fcrx (GitHub-reviewed advisory GHSA-r736-2678-fcrx lists affected ranges: Packagist facturascripts/facturascripts >=0 <=2025.92)

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