CVE-2025-59526
LowCVSS 2.7Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
Mailgen, a Node.js package for generating responsive HTML emails, before version 2.0.30 has an HTML injection vulnerability in plaintext emails generated by the Mailgen.generatePlaintext(email) method. Projects are affected if this method is used with user-generated content. The vulnerability has been patched in version 2.0.30.
Risk Assessment
An attacker could inject malicious HTML into email messages, potentially leading to phishing or attacks on recipients. The organization may face trust compromise.
Recommendation
Update Mailgen to version 2.0.30 or later. If not possible, strip all HTML tags from content before passing it to Mailgen.generatePlaintext(email).
Other vulnerabilities in Mailgen
See all- CVE-2025-62380Low
Mailgen (Node.js package) through version 2.0.31 contains an HTML injection vulnerability in plaintext emails generated with the generatePlaintext method when user generated content is supplied. Tags with certain Unicode line separator characters are not removed, allowing unexpected HTML to remain in output.
- CVE-2025-62366Low
mailgen is a Node.js package that generates responsive HTML e-mails for sending transactional mail. Mailgen versions through 2.0.30 contain an HTML injection vulnerability in plaintext emails produced by the generatePlaintext method when user-generated content is supplied. The function attempts to remove HTML tags, but if tags are provided as encoded HTML entities they are not removed and are later decoded, resulting in active HTML (for example an img tag with an event handler) in the supposed plaintext output. In contexts where the generated plaintext string is subsequently rendered as HTML, this can allow execution of attacker-controlled JavaScript. Versions 2.0.31 and later contain a fix. No known workarounds exist.
Original NVD description (English source)
mailgen is a Node.js package that generates responsive HTML e-mails for sending transactional mail. Prior to version 2.0.30, there is an HTML injection vulnerability in plaintext e-mails generated by Mailgen. Projects are affected if the Mailgen.generatePlaintext(email) method is used and given user-generated content. This vulnerability has been patched in version 2.0.30. A workaround involves stripping all HTML tags before passing any content into Mailgen.generatePlaintext(email).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS