What’s Vulnerable › Vulnerabilities

CVE-2026-33742: Invoice Ninja has Stored XSS via Markdown HTML Injection in Product Notes

• 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: yes
• 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. Product notes fields in Invoice Ninja v5.13.0 allow raw HTML via Markdown rendering, enabling stored XSS. The Markdown parser output was not sanitized with `purify::clean()` before being included in invoice templates. This is fixed in v5.13.4 by the vendor by adding `purify::clean()` to sanitize Markdown output.

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/releases/tag/v5.13.4
• https://github.com/invoiceninja/invoiceninja/security/advisories/GHSA-xph7-9749-56mh
• https://github.com/invoiceninja/invoiceninja/security/advisories/GHSA-xph7-9749-56mh

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