Uninitialized PHP valirables, crossite scripting.
vulners.com/securityvulns/securityvulns:doc:2406
vulners.com/securityvulns/securityvulns:doc:2407
vulners.com/securityvulns/securityvulns:doc:2450
vulners.com/securityvulns/securityvulns:doc:2694
vulners.com/securityvulns/securityvulns:doc:3517
vulners.com/securityvulns/securityvulns:doc:3837