Description
WordPress Plugin Captcha by BestWebSoft 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 Captcha by BestWebSoft version 4.2.9 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 4.3.0 or latest
References
https://packetstormsecurity.com/files/142118/WordPress-BestWebSoft-XSS-CSRF.html
Related Vulnerabilities
ownCloud Improper Authentication Vulnerability (CVE-2014-9045)
Joomla Improper Input Validation Vulnerability (CVE-2020-10240)
WordPress Ultimate Member Plugin CVE-2020-36157 Vulnerability (CVE-2020-36157)
WordPress Plugin Quiz Tool Lite Multiple Cross-Site Scripting Vulnerabilities (2.3.15)
WordPress Plugin Fluid Responsive Slideshow Multiple Vulnerabilities (2.2.6)