What’s Vulnerable › Vulnerabilities

CVE-2026-33628: Invoice Ninja Denylist Bypass may Lead to Stored XSS via Invoice Line Items

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-26 · updated 2026-06-17
• Weakness: CWE-79

Description

Invoice Ninja is a source-available invoice, quote, project and time-tracking app built with Laravel. 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. This is fixed in v5.13.4 by the vendor by adding `purify::clean()` to sanitize line item descriptions.

Affected products

• invoiceninja: before 5.13.4 — fixed in 5.13.4

How to fix

Upgrade to a fixed version: invoiceninja 5.13.4. Check the vendor advisory for mitigations.

References

• https://github.com/invoiceninja/invoiceninja/commit/b81a3fc302573fc4a53d61e8537dd19154ce1091
• https://github.com/invoiceninja/invoiceninja/releases/tag/v5.13.4
• https://github.com/invoiceninja/invoiceninja/security/advisories/GHSA-98wm-cxpw-847p
• https://github.com/invoiceninja/invoiceninja/security/advisories/GHSA-98wm-cxpw-847p

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