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NKaOZCD8) OR 687=(SELECT 687 FROM PG_SLEEP(15))--?
Vastaus:
It seems like you're trying to execute an SQL injection attack using a payload designed to test for SQL vulnerabilities in a database. The expression looks like it's crafted to delay response from the database (via the `PG_SLEEP(15)` function) if the injected query is successfully processed.
Please note that SQL injection is illegal and unethical. It can lead to serious repercussions, including criminal charges, and it violates the terms of service of most database systems and applications. If you're a developer or administrator, it's crucial to ensure that your applications are secure against such types of vulnerabilities.
If you have questions regarding web security or how to protect against such vulnerabilities, feel free to ask!