CVE-2023-28496: 
WordPress vulnerability analysis and mitigation

A Stored Cross-Site Scripting (XSS) vulnerability was discovered in the SMTP2GO – Email Made Easy WordPress plugin versions 1.4.2 and below. The vulnerability was identified on March 16, 2023, and requires administrator or higher privileges to exploit (Patchstack).

The vulnerability occurs because the plugin does not properly sanitize and escape some of its settings, which could allow high-privilege users such as administrators to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed, such as in multisite setups. The vulnerability has been assigned a CVSS v3.1 base score of 4.8 (Medium) by NIST with a vector string of CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. The vulnerability is classified as CWE-79: Improper Neutralization of Input During Web Page Generation (WPScan, NVD).

The vulnerability could allow malicious actors with administrative access to inject malicious scripts, including redirects, advertisements, and other HTML payloads into the website, which would be executed when guests visit the site (Patchstack).

The vulnerability has been fixed in version 1.5.0 of the SMTP2GO plugin. Users are advised to update to version 1.5.0 or later to remove the vulnerability. Patchstack users can enable auto-update for vulnerable plugins (Patchstack).