Web Hacking
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SQL Injection
The string-concatenation bug that has emptied more credential tables than any other. The mechanism byte by byte — how attacker input escapes the string context and becomes SQL syntax — then every extraction technique (UNION, error-based, blind boolean, time-based, OOB DNS), DBMS-specific quirks, WAF bypasses, escalation to RCE via INTO OUTFILE, the sqlmap workflow, and a per-stack fix list.
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