Description
WordPress Plugin Check & Log Email 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 Check & Log Email version 0.5.1 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 0.5.2 or latest
References
https://sumofpwn.nl/advisory/2016/cross_site_scripting_in_check_email_wordpress_plugin.html
https://packetstormsecurity.com/files/139818/WordPress-Check-Email-0.3-Cross-Site-Scripting.html
Related Vulnerabilities
WordPress Plugin Skysa App Bar Integration 'submit' Parameter Cross-Site Scripting (1.03)
WordPress Plugin Popup Maker-Popup for opt-ins, lead gen, & more Security Bypass (1.7.29)
Moodle Permissions, Privileges, and Access Controls Vulnerability (CVE-2012-2356)
WordPress Plugin Side Menu Lite-add sticky fixed buttons SQL Injection (2.2.5)