The Viral Signup WordPress plugin through 2.1 does not properly sanitise and escape a parameter before using it in a SQL statement via an AJAX action available to unauthenticated users, leading to a SQL injection
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.
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https://wpscan.com/vulnerability/9ce96ce5-fcf0-4d7a-b562-f63ea3418d93/ | third party advisory vdb entry exploit technical description |