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Recently there have been claims that hackers have been causing PHP object injection through SQL injection vulnerabilities in WordPress plugins. The details needed to allow others to confirm whether or not that is true had not been provided (which didn’t stop journalist from repeating the claims) and in our testing we were not able to figure out a way to get that to work with the plugins that it has been claimed it had occurred with. It is possible that we have missed something or it is possible that there was a belief that it could occur leading to hackers attempting it, but it really wasn’t possible in those plugins.
Last week we mentioned that we had recently seen what looked to be probing for the usage of the SendinBlue Subscribe Form And WP SMTP and another plugin. That other plugin is Table Maker, which we had been seeing requests for its readme.txt like this: /wp-content/plugins/table-maker/readme.txt. One of the few possible explanations for requests like that is that someone is probing for usage of the plugin to know what websites to exploit through a vulnerability in the plugin.