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
WordPress Plugin G Auto-Hyperlink SQL Injection (1.0.1)
WordPress Plugin Abandoned Cart Lite for WooCommerce Cross-Site Scripting (5.1.3)
WordPress Plugin Elements For Elementor Local File Inclusion (2.1)
WordPress Plugin Alpine PhotoTile for Instagram Cross-Site Scripting (1.2.6.5)
PHP Resource Management Errors Vulnerability (CVE-2014-0237)