XSS in Invoiceninja Invoice Ninja
CVE-2026-33742
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (14.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Invoiceninja Invoice Ninja
- Invoiceninja — versions < 5.13.4
Weakness classification (CWE)
References
- github.com/invoiceninja/invoiceninja/security/advisories/GHSA-xph7-9749-56mh (Exploit, Vendor Advisory)
- github.com/invoiceninja/invoiceninja/releases/tag/v5.13.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-33742?
- CVE-2026-33742 is a medium-severity vulnerability in Invoiceninja Invoice Ninja, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-26.
- How severe is CVE-2026-33742?
- Medium severity. CVSS v3 base score is 5.4 out of 10.