CVE-2026-27492

Lettermint Node.js SDK (npm package lettermint) is vulnerable in versions ≤ 1.5.0 where email properties (to, subject, html, text, attachments) are not reset between sends when a single client instance is reused across multiple .send() calls. This state leakage can cause content or recipient addr...

CVE-2026-27492 Lettermint Node.js SDK leaks email properties to unintended recipients when client instance is reused

Lettermint Node.js SDK is the official Node.js SDK for Lettermint. In versions 1.5.0 and below, email properties such as to, subject, html, text, and attachments are not reset between sends when a single client instance is reused across multiple .send calls. This can cause properties from a...