No patched version is available. Deactivate and delete. This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress. The last version was released in the 2012 year.
Lenon Leite discovered and reported this SQL Injection vulnerability in WordPress 3xSocializer Plugin. This could allow a malicious actor to directly interact with your database, including but not limited to stealing information and creating new administrator accounts. This vulnerability has not been known to be fixed yet.