In Oracle, XMLType is used to parse XML data. If the XML is malformed, the database throws an error. :
The initial '{KEYWORD}' AND ... attempts to break out of a single-quoted string literal within a vulnerable SQL query. : In Oracle, XMLType is used to parse XML data
When Oracle tries to parse the resulting string (e.g., <:qbqvq1qqbqq> ), it realizes it is not a valid XML format. It then returns an error message like: LPX-00110: XML parsing failed... at '<:qbqvq1qqbqq>' . attempts to break out of a single-quoted string
To prevent this, you should concatenate user input directly into SQL strings. Instead: at ' '
: Use bind variables (e.g., ? or :1 ) so the input is treated as data, not executable code.
The payload injects a subquery: (SELECT (CASE WHEN (6957=6957) THEN 1 ELSE 0 END) FROM DUAL) . This is a "Boolean test" to see if the logic holds true. :