Vulnerability Description
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 previous send to leak into a subsequent one, potentially delivering content or recipient addresses to unintended parties. Applications sending emails to different recipients in sequence — such as transactional flows like password resets or notifications — are affected. This issue has been fixed in version 1.5.1.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Lettermint | Lettermint | < 1.5.1 |
Related Weaknesses (CWE)
References
- https://github.com/lettermint/lettermint-node/blob/main/CHANGELOG.md#151-2026-02Release Notes
- https://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3Patch
- https://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936Vendor AdvisoryMitigation
FAQ
What is CVE-2026-27492?
CVE-2026-27492 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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 s...
How severe is CVE-2026-27492?
CVE-2026-27492 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27492?
Check the references section above for vendor advisories and patch information. Affected products include: Lettermint Lettermint.