OWASP Periodic Table of Vulnerabilities - SSI Injection
Root Cause Summary
The root cause of server-side includes/injection is the application's failure to validate data before it is inserted into a server-side interpreted HTML file. Some Web servers allow entering dynamic code to static HTML pages making it possible for an attacker to send code to a web application that will get executed by the web server similar to cross site scripting.
Browser / Standards Solution
Generic Framework Solution
Do not support SSI with dynamic file names.
Custom Framework Solution
Custom Code Solution
Discussion / Controversy
SSI Injection is sometimes called Server-side Include