Vulnerability · Published Mar 26, 2026 · Assigned by GitHub_M

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

Medium 5.4

In plain English

A medium-severity cross-site scripting in invoiceninja from invoiceninja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 88.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
invoiceninja	invoiceninja	< 5.13.4

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

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