The malicious XML message is used to compel recursive entity expansion (or other repetitive processing) that consumes all of the server's resources. The "many laughs" attack (also known as the "billion laughs" attack) is the most common example of this type of attack.
XML is one of the most extensively used formats for exchanging structured data today, both locally and across networks: between programmes, between people, and between computers and people. If you've worked with HTML before, you'll see that XML is pretty similar.
When user input is injected into a server-side XML document or SOAP message in an unsafe fashion, XML or SOAP injection vulnerabilities occur. It may be possible to adjust the structure of the generated XML using XML metacharacters.
SQL injection, often known as SQLI, is a typical attack vector in which malicious SQL code is used to manipulate backend databases and get access to data that was not intended to be displayed. This data could encompass everything from sensitive company data to user lists to private consumer information.
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