SB2026052733 - Improper Certificate Validation in nodemailer

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Main Vulnerability Database SB2026052733

SB2026052733 - Improper Certificate Validation in nodemailer

Published: May 27, 2026

Security Bulletin ID SB2026052733
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Certificate Validation (CVE-ID: N/A)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive OAuth credentials.

The vulnerability exists due to improper certificate validation in the internal HTTPS fetch client in lib/fetch/index.js when retrieving OAuth2 tokens over HTTPS. A remote attacker can perform a machine-in-the-middle attack using an invalid or self-signed certificate to disclose sensitive OAuth credentials.

The issue affects OAuth2 token requests and related outbound HTTPS requests that use the internal fetch implementation.


Remediation

Install update from vendor's website.

References