EUVD-2026-16418CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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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.
Analysis
Stored cross-site scripting (XSS) in Invoice Ninja v5.13.0 through v5.13.3 allows authenticated attackers with product notes field access to inject and execute arbitrary JavaScript in invoice templates via unvalidated Markdown rendering. The vulnerability affects all Invoice Ninja instances running affected versions where the Markdown parser output bypasses HTML sanitization, enabling session hijacking, credential theft, or malicious template manipulation for other users viewing invoices. …
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Remediation
Within 30 days: Identify affected systems running Invoice Ninja and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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