CVE-2023-23980: 
WordPress vulnerability analysis and mitigation

A Stored Cross-Site Scripting (XSS) vulnerability was discovered in the MailOptin Popup Builder Team MailOptin WordPress plugin versions 1.2.54.0 and below. The vulnerability was disclosed on January 20, 2023, and requires administrator-level 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 (for example in multisite setup). The vulnerability has been assigned a CVSS v3.1 base score of 4.8 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N, indicating that it requires high privileges and user interaction to exploit (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 1.2.54.1 of the MailOptin plugin. Users are advised to update to this version or later to remove the vulnerability. Patchstack users can enable auto-update for vulnerable plugins as an additional security measure (Patchstack).