{"id":"GHSA-49pc-8936-wvfp","summary":"Lettermint Node.js SDK leaks email properties to unintended recipients when client instance is reused","details":"### Impact\nEmail 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.\n\n### Patches\nYes, the issue has been patched. Users should upgrade to v1.5.1 or later.\n\n### Workarounds\nIf upgrading immediately is not possible, instantiate a new client for each send:\n```js\nconst client = new Lettermint({ apiKey: process.env.LETTERMINT_API_KEY });\nawait client.email.to('...').subject('...').html('...').send();\n```\n\nThis ensures no state is carried over between sends.","aliases":["CVE-2026-27492"],"modified":"2026-02-23T22:53:00.479537Z","published":"2026-02-20T21:14:49Z","database_specific":{"nvd_published_at":"2026-02-21T11:15:57Z","cwe_ids":["CWE-488"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-02-20T21:14:49Z"},"references":[{"type":"WEB","url":"https://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936-wvfp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27492"},{"type":"WEB","url":"https://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3dc0ea7aaf4de1"},{"type":"PACKAGE","url":"https://github.com/lettermint/lettermint-node"},{"type":"WEB","url":"https://github.com/lettermint/lettermint-node/blob/main/CHANGELOG.md#151-2026-02-20"}],"affected":[{"package":{"name":"lettermint","ecosystem":"npm","purl":"pkg:npm/lettermint"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.5.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-49pc-8936-wvfp/GHSA-49pc-8936-wvfp.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}