CVE-2026-75962
Received Received - Intake

Stored XSS in Post SMTP WordPress Plugin

Publication date: 2026-10-06

Last updated on: 2026-10-06

Assigner: Wordfence

Description
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.

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Meta Information

Published
2026-10-06
Last Modified
2026-10-06
Generated
2026-10-06
AI Q&A
2026-10-06
EPSS Evaluated
N/A
NVD
CVE-2026-75962
EUVD
EUVD-2026-92961

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
saadiqbal Post SMTP – Complete Email Delivery and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Post SMTP WordPress plugin up to version 4.0.1. It allows unauthenticated attackers to inject malicious scripts via the 'user_email' parameter due to poor input sanitization and output escaping. The injected scripts execute when users view affected pages.

Detection Guidance

Check WordPress sites running the Post SMTP plugin up to version 4.0.1 for suspicious email logs containing HTML character references in the user_email field. Inspect pages where unauthenticated users can register for injected scripts.

Impact Analysis

Attackers could steal user sessions, redirect to malicious sites, or perform actions on behalf of users. On WordPress Multisite with public registration, unauthenticated attackers can exploit this without needing access. The vulnerability persists in email logs, making it harder to detect.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality requirements. For HIPAA, it may risk protected health information exposure. Compliance could be compromised if user data is compromised through this flaw.

Mitigation Strategies

Update the Post SMTP plugin to the latest version immediately. Disable public registration on WordPress Multisite installations if not required. Review and sanitize email logs for malicious entries.

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