SQL injection vulnerability in the Freetag (serendipity_event_freetag) plugin before 3.09 for Serendipity (S9Y) allows remote attackers to execute arbitrary SQL commands via an unspecified parameter associated with Meta keywords in a blog entry.
Improper Neutralization of Special Elements used in an SQL Command The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.