mailgen vulnerabilities

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.

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.

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.