What’s Vulnerable › Vulnerabilities

CVE-2023-6621: Post SMTP < 2.8.7 - Reflected Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-01-03 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• saadiqbal Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App: before 2.8.7 — fixed in 2.8.7

How to fix

Upgrade to a fixed version: saadiqbal Post SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App 2.8.7. Check the vendor advisory for mitigations.

References

• https://wpscan.com/vulnerability/b49ca336-5bc2-4d72-a9a5-b8c020057928
• https://wpscan.com/vulnerability/b49ca336-5bc2-4d72-a9a5-b8c020057928

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