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Vulnerability Details :

CVE-2026-27492

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-21 Feb, 2026 | 10:16
Updated At-24 Feb, 2026 | 18:08
Rejected At-
Credits

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 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.

Vendors
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Not available
Products
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Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
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N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:21 Feb, 2026 | 10:16
Updated At:24 Feb, 2026 | 18:08
Rejected At:
▼CVE Numbering Authority (CNA)
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 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.

Affected Products
Vendor
lettermint
Product
lettermint-node
Versions
Affected
  • < 1.5.1
Problem Types
TypeCWE IDDescription
CWECWE-488CWE-488: Exposure of Data Element to Wrong Session
Type: CWE
CWE ID: CWE-488
Description: CWE-488: Exposure of Data Element to Wrong Session
Metrics
VersionBase scoreBase severityVector
3.14.7MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Version: 3.1
Base score: 4.7
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936-wvfp
x_refsource_CONFIRM
https://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3dc0ea7aaf4de1
x_refsource_MISC
https://github.com/lettermint/lettermint-node/blob/main/CHANGELOG.md#151-2026-02-20
x_refsource_MISC
Hyperlink: https://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936-wvfp
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3dc0ea7aaf4de1
Resource:
x_refsource_MISC
Hyperlink: https://github.com/lettermint/lettermint-node/blob/main/CHANGELOG.md#151-2026-02-20
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:21 Feb, 2026 | 11:15
Updated At:24 Feb, 2026 | 15:00

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.7MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 4.7
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CPE Matches

lettermint
lettermint
>>lettermint>>Versions before 1.5.1(exclusive)
cpe:2.3:a:lettermint:lettermint:*:*:*:*:*:node.js:*:*
Weaknesses
CWE IDTypeSource
CWE-488Primarysecurity-advisories@github.com
CWE ID: CWE-488
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/lettermint/lettermint-node/blob/main/CHANGELOG.md#151-2026-02-20security-advisories@github.com
Release Notes
https://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3dc0ea7aaf4de1security-advisories@github.com
Patch
https://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936-wvfpsecurity-advisories@github.com
Vendor Advisory
Mitigation
Hyperlink: https://github.com/lettermint/lettermint-node/blob/main/CHANGELOG.md#151-2026-02-20
Source: security-advisories@github.com
Resource:
Release Notes
Hyperlink: https://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3dc0ea7aaf4de1
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936-wvfp
Source: security-advisories@github.com
Resource:
Vendor Advisory
Mitigation

Change History

0
Information is not available yet

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