CVE-2026-27492— Lettermint Node.js SDK leaks email properties to unintended recipients when client instance is reused
Quick assessment
Affected
lettermint lettermint-node
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Lettermint Node.js SDK是Lettermint开源的一个开发者工具包。 Lettermint Node.js SDK 1.5.0及之前版本存在安全漏洞，该漏洞源于重用客户端实例时电子邮件属性未重置，可能导致先前发送的属性泄露到后续邮件中。
Possible ATT&CK Techniques 1 AI
T1005 · Data from Local System
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-27492
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Lettermint Node.js SDK leaks email properties to unintended recipients when client instance is reused
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对错误会话暴露数据元素
Source: CVE Program / CVE List V5
Vulnerability Title
Lettermint Node.js SDK 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lettermint Node.js SDK是Lettermint开源的一个开发者工具包。 Lettermint Node.js SDK 1.5.0及之前版本存在安全漏洞，该漏洞源于重用客户端实例时电子邮件属性未重置，可能导致先前发送的属性泄露到后续邮件中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| lettermint | lettermint-node | < 1.5.1 | - |
|
II. Public POCs for CVE-2026-27492
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-27492
请登录查看更多情报信息。
Vendor Advisories for CVE-2026-27492 (1)
IV. Related Vulnerabilities
Same weakness: CWE-488
-
CVE-2026-103544
datadrivenconstruction OpenConstructionERP Al Provider Confi -
CVE-2026-88017
rclone: FTP cross-session auth-proxy backend confusion -
CVE-2026-84685
Improper Cache Isolation in auth0/react-native-auth0 SDK Web -
CVE-2026-86492
JetBrains YouTrack 会话机制问题漏洞 -
CVE-2026-80231
native CA store conn reuse
V. Comments for CVE-2026-27492
No comments yet