Description
WordPress Plugin Contact Form Clean and Simple 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 Contact Form Clean and Simple version 4.7.0 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 4.7.1 or latest
References
https://jrjmulder.nl/plugins/contact-form-clean-and-simple-4-7-0-authenticated-stored-xss/
https://www.youtube.com/watch?v=mKg0TUqEhC8
https://plugins.svn.wordpress.org/clean-and-simple-contact-form-by-meg-nicholas/trunk/readme.txt
Related Vulnerabilities
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WordPress Plugin URL Cloak & Encrypt Cross-Site Scripting (2.0)
WordPress Plugin Echo Sign Multiple Cross-Site Scripting Vulnerabilities (1.1)
WordPress Plugin Related Sites 'guid' Parameter SQL Injection (2.1)