CVE-2026-3455: Nodemailer Mailparser

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Versions of the package mailparser before 3.9.3 are vulnerable to Cross-site Scripting (XSS) via the textToHtml() function due to the improper sanitisation of URLs in the email content. An attacker can execute arbitrary scripts in victim browsers by adding extra quote " to the URL with embedded malicious JavaScript code.

Affected products

• Nodemailer Mailparser: before 3.9.3 (fixed in 3.9.3)

Published 2026-03-03. Last modified 2026-06-17.