HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-75962 — The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs,...

·Source: NIST NVD

Updated:

Executive Summary

The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts

Analysis

The Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'user_email' parameter in all versions up to, and including, 4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable without authentication on WordPress Multisite installations with public registration enabled, as WordPress accepts email addresses containing numeric HTML character references that Post SMTP's stricter validator rejects, persisting the attacker-controlled address verbatim to the email log via the failed-send exception message. CVSS Score: 7.2. Published: 2026-10-06T06:17:01.687.

Indicators of Compromise (1)

CVE (1)
CVE-2026-75962
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Oct 6, 2026. Verified by: NIST.

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