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Vulnerability record · CVE-2023-6621 · published 3 January 2024

CVE-2023-6621: Wpexperts post smtp cross-site scripting vulnerability

Wpexperts · Post Smtp

The POST SMTP WordPress plugin before 2.8.7 does not sanitise and escape the msg parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.

6.1 CVSS 3.1 Medium EPSS 0.40% · top 67.7% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The POST SMTP WordPress plugin before 2.8.7 does not sanitise and escape the msg parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wpscan.com/vulnerability/b49ca336-5bc2-4d72-a9a5-b8c020057928 ExploitThird Party Advisory
https://wpscan.com/vulnerability/b49ca336-5bc2-4d72-a9a5-b8c020057928 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-52233Wpexperts post smtp missing authorization vulnerabilityMissing Authorization vulnerability in Post SMTP Post SMTP Mailer/Email Log.This issue affects Post SMTP Mailer/Email Log: from n/a through 2.8.6.EPSS 0.37%9.8CVE-2023-6875WordPress POST SMTP Mailer plugin type juggling allows unauthenticated API key reset and log accessThe POST SMTP Mailer WordPress plugin (all versions up to and including 2.8.7) has a type juggling flaw on the connect-app REST endpoint that bypasse…EPSS 90%analysed8.8CVE-2025-22800Wpexperts post smtp missing authorization vulnerabilityMissing Authorization vulnerability in Saad Iqbal Post SMTP post-smtp allows Exploiting Incorrectly Configured Access Control Security Levels.This is…EPSS 0.39%8.8CVE-2023-3179Wpexperts post smtp cross-site request forgery vulnerabilityThe POST SMTP Mailer WordPress plugin before 2.5.7 does not have proper CSRF checks in some AJAX actions, which could allow attackers to make logged …EPSS 0.39%7.2CVE-2024-52436Wpexperts post smtp sql injection vulnerabilityImproper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Saad Iqbal Post SMTP post-smtp allows Blind SQL…EPSS 0.46%7.2CVE-2024-5207Wpexperts post smtp sql injection vulnerabilityThe POST SMTP – The #1 WordPress SMTP Plugin with Advanced Email Logging and Delivery Failure Notifications plugin for WordPress is vulnerable to tim…EPSS 0.50%7.2CVE-2023-6620Wpexperts post smtp sql injection vulnerabilityThe POST SMTP Mailer WordPress plugin before 2.8.7 does not properly sanitise and escape several parameters before using them in SQL statements, lead…EPSS 14%7.2CVE-2022-2352Wpexperts post smtp server-side request forgery (ssrf) vulnerabilityThe Post SMTP Mailer/Email Log WordPress plugin before 2.1.7 does not have proper authorisation in some AJAX actions, which could allow high privileg…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2023-6621), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.