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Tachyondecay Vanilla Guestbook Multiple Input Validation Vulnerabilities

Vanilla Guestbook is prone to multiple cross-site scripting and SQL-injection vulnerabilities because the application fails to properly sanitize user-supplied input that will be included in site output or in SQL queries.

Exploiting the cross-site scripting vulnerability may permit a remote attacker to steal cookie-based authentication credentials from legitimate users. Successful exploitation of SQL-injection vulnerabilities could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database implementation.