Description
WordPress Plugin Web Invoice-Invoicing and billing for WordPress is prone to multiple SQL injection vulnerabilities because it fails to sufficiently sanitize user-supplied data 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. WordPress Plugin Web Invoice-Invoicing and billing for WordPress version 2.1.3 is vulnerable; prior versions may also be affected.
Remediation
Disable and remove the plugin until a fix is available
References
https://bulletin.iese.de/post/web-invoice_2-1-3_1/