Invoice Ninja has Stored XSS via Markdown HTML Injection in Product Notes
Priority MEDIUM 58CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00209 11th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed invoiceninja (invoiceninja): 5.13.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| invoiceninja | invoiceninja | before 5.13.4 | 5.13.4 | Patch available | CNA |
- invoiceninja Vendorinvoiceninja Affected before 5.13.4 Fixed in 5.13.4 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:invoiceninja:invoice_ninja:*:*:*:*:*:*:*:* | before 5.13.4 | Vulnerable | invoiceninja |
- cpe:2.3:a:invoiceninja:invoice_ninja:*:*:*:*:*:*:*:* Versions before 5.13.4 Vulnerable ·invoiceninja
Remediation
- Fix · CNA invoiceninja (invoiceninja) Fixed in 5.13.4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-33742
References
More invoiceninja Invoice Ninja vulnerabilities
- TI-2026-23400 Invoice Ninja v5.12.46 and v5.12.48 is vulnerable to Server-Side Request Forgery (SSRF) in CheckDatabaseRequest.php. CVSS 3.1HIGH 7.7
- TI-2026-26010 Invoice Ninja Denylist Bypass may Lead to Stored XSS via Invoice Line Items CVSS 3.1MEDIUM 5.4
- TI-2021-13213 In Invoice Ninja before 4.4.0, there is an unsafe call to unserialize() in… CVSS 3.1HIGH 8.1
- TI-2017-14676 Invoice Ninja version 3.8.1 is vulnerable to stored cross-site scripting vulnerability… CVSS 3.0MEDIUM 5.4
- TI-2021-02874 Cross-site Scripting (XSS) - Stored in invoiceninja/invoiceninja CVSS 3.1MEDIUM 5.4
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences