This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
This Signature detects attempt to exploit Joomla sql-injection vulnerability.
Joomla! Core is prone to an sql-injection vulnerability because it fails to properly sanitize user-supplied input before using it in an SQL query.
Exploiting these issues could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.