Exposure of Data Element to Wrong Session Affecting lettermint package, versions <1.5.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-LETTERMINT-15325862
- published23 Feb 2026
- disclosed20 Feb 2026
- creditUnknown
Introduced: 20 Feb 2026
NewCVE-2026-27492 (opens in a new tab)How to fix?
Upgrade lettermint to version 1.5.1 or higher.
Overview
lettermint is an Official Lettermint Node.js SDK
Affected versions of this package are vulnerable to Exposure of Data Element to Wrong Session via .send() calls. An attacker can access sensitive email properties intended for previous recipients when a client instance is used across multiple email sends. This can result in unintended disclosure of email content or recipient addresses to unauthorized parties.
Workaround
This vulnerability can be mitigated by instantiating a new client for each email sent, preventing state from being carried over between sends.