Description
WordPress Plugin Simple Popup Newsletter is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. WordPress Plugin Simple Popup Newsletter version 1.4.7 is vulnerable; prior versions may also be affected.
Remediation
Edit the source code to ensure that input is properly sanitised or disable the plugin until a fix is available
References
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34658
https://wordpress.org/plugins/simple-popup-newsletter/#description
Related Vulnerabilities
WordPress Plugin Simple Download Monitor Cross-Site Scripting (3.9.10)
WordPress Plugin CMS Tree Page View Cross-Site Request Forgery (1.2.4)
WordPress Plugin WP Meta and Date Remover Cross-Site Request Forgery (1.7.5)
WordPress Plugin Lazy Load Cross-Site Scripting (0.6)
WordPress Plugin Custom Scrollbar Designer Cross-Site Scripting (1.0)