Invoice Ninja Denylist Bypass may Lead to Stored XSS via Invoice Line Items

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-2026-33628: 0.24% estimated exploitation activity in the next 30 days; percentile 15.17 (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.

Vulnerability Details Invoice line item descriptions in Invoice Ninja v5.13.0 bypass the XSS denylist filter, allowing stored XSS payloads to execute when invoices are rendered in the PDF preview or client portal. The line item description field was not passed through purify::clean() before rendering. Steps to Reproduce 1. Login as any authenticated user 2. Create or edit an invoice 3. In a line item description, enter: <img src=x onerror=alert(document.cookie) 4. Save the invoice and preview it 5. The XSS payload executes in the browser Impact - Attacker: Any authenticated user who can create invoices - Victim: Any user viewing the invoice (including clients via the portal) - Specific damage: Session hijacking, account takeover, data exfiltration Proposed Fix Fixed in v5.13.4 by the vendor by adding purify::clean() to sanitize line item descriptions.

Published by the source

24 Mar 2026, 20:40 UTC

Last modified by the source

27 Mar 2026, 21:34 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-98wm-cxpw-847p

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# Patch Next advisory brief: CVE-2026-33628

Advisory: Invoice Ninja Denylist Bypass may Lead to Stored XSS via Invoice Line Items
IDs: CVE-2026-33628, GHSA-98wm-cxpw-847p
Record: https://patchnext.com/advisories/cve-2026-33628 (revision 1, source checked 26 Oct 2026, 14:39 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 fix available; fixed versions by package: invoiceninja/invoiceninja 5.13.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist invoiceninja/invoiceninja: affected < 5.13.4; fixed in 5.13.4

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

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on invoiceninja/invoiceninja.
- 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-98wm-cxpw-847p (GitHub-reviewed advisory GHSA-98wm-cxpw-847p lists affected ranges: Packagist invoiceninja/invoiceninja >=0 <5.13.4)

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