XSS in Saadiqbal Post Smtp – Complete Email Delivery And Solution With Logs, Alerts, Backup & Mobile App

CVE-2026-75962

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-75962?
CVE-2026-75962 is a high-severity vulnerability in Saadiqbal Post Smtp – Complete Email Delivery And Solution With Logs, Alerts, Backup & Mobile App, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-10-06.
How severe is CVE-2026-75962?
High severity. CVSS v3 base score is 7.2 out of 10.