Upper(xmltype(chr(60)||chr(58)||chr(113)||chr(98)||chr(113)||chr(118)||chr(113)||(select (case When (6957=6957) Then 1 Else 0 End) From Dual)||chr(113)||chr(113)||chr(98)||chr(113)||chr(113)||chr(62))) From Dual) And 'plsa'='pls: {keyword}' And 6957=(select

The attacker sees this error in the HTTP response. Because the error contains the 1 (the result of the subquery), the attacker knows the injection worked. :

: SQL Injection (Error-Based/Out-of-Band). The attacker sees this error in the HTTP response

: Strict allow-listing of expected characters for the {KEYWORD} field. : Strict allow-listing of expected characters for the

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>' . at ' '

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. :

The CHR() functions are used to bypass simple text filters. They translate to: CHR(60) = < CHR(58) = :

The payload attempts to force the database to trigger an error message that contains specific data, which confirms the vulnerability and the database type. :