Description
Joomla! Core is prone to multiple vulnerabilities, including cross-site scripting and information disclosure vulnerabilities. Exploiting these issues could allow an attacker to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, allowing the attacker to steal cookie-based authentication credentials, or to obtain sensitive information that may help in launching further attacks. Joomla! Core versions ranging from 1.5.0 and up to and including 3.7.2 are vulnerable.
Remediation
Update to Joomla! Core version 3.7.3 or latest
References
http://blog.fortinet.com/2017/05/04/multiple-joomla-core-xss-vulnerabilities-are-discovered
https://developer.joomla.org/security-centre/683-core-information-disclosure.html
https://developer.joomla.org/security-centre/685-core-xss-vulnerability.html
https://developer.joomla.org/security-centre/686-core-xss-vulnerability.html
https://fortiguard.com/zeroday/FG-VD-17-107
https://developer.joomla.org/security-centre/698-20170603-core-xss-vulnerability.html
Related Vulnerabilities
WordPress Plugin Metronet Tag Manager Cross-Site Request Forgery (1.2.7)
WordPress Plugin Video Lead Form 'errMsg' Parameter Cross-Site Scripting (0.5)
WordPress Plugin Form Vibes-Database Manager for Forms SQL Injection (1.4.10)
WordPress Plugin Mingle Forum 'edit_post_id' Parameter SQL Injection (1.0.31)