The Easy Social Feed WordPress plugin before 6.5.6 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admin
The Easy Social Feed – Social Photos Gallery – Post Feed – Like Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'efb_likebox' shortcode in all versions up to, and including, 6.5.4 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
The Easy Social Feed – Social Photos Gallery – Post Feed – Like Box plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 6.5.4. This is due to missing or incorrect nonce validation on the esf_insta_save_access_token and efbl_save_facebook_access_token functions. This makes it possible for unauthenticated attackers to connect their facebook and instagram pages to the site via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
The Easy Social Feed – Social Photos Gallery – Post Feed – Like Box plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 6.5.4. This is due to missing or incorrect nonce validation on the save_groups_list function. This makes it possible for unauthenticated attackers to disconnect a site's facebook or instagram page/group connection via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.