HOMEVULNERABILITIESCVE-2026-27492
MEDIUM

CVE-2026-27492

CWE-488Published: February 21, 2026· Updated: Feb 24, 2026

4.7
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27492 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 4.7.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

lettermint1 product
lettermint
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3dc0ea7aaf4de1
ADVISORYhttps://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936-wvfp

All References (3)

→
https://github.com/lettermint/lettermint-node/blob/main/CHANGELOG.md#151-2026-02-20Release Notes
→
https://github.com/lettermint/lettermint-node/commit/24a17acbc2429c5eb30391f9df3dc0ea7aaf4de1Patch
→
https://github.com/lettermint/lettermint-node/security/advisories/GHSA-49pc-8936-wvfpVendor Advisory · Mitigation

Quick Facts

CVE IDCVE-2026-27492
CVSS Score4.7 / 10
SeverityMEDIUM
WeaknessCWE-488
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedFeb 21, 2026

Related CVEs (CWE-488)

CVE-2026-54311
7.7
CVE-2026-34391
7.5
CVE-2026-23919
7.1
CVE-2026-14621
3.1

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-27492 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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