Version 3.3.23 of the Sassy Social Share WordPress plugin is vulnerable to PHP Object Injection via the wp_ajax_heateor_sss_import_config AJAX action due to deserialization of unvalidated user supplied inputs via the import_config function found in the ~/admin/class-sassy-social-share-admin.php file. This can be exploited by underprivileged authenticated users due to a missing capability check on the import_config function.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-39321
• https://plugins.trac.wordpress.org/changeset/2600464/sassy-social-share/trunk/admin/class-sassy-social-share-admin.php
• https://www.wordfence.com/blog/2021/10/vulnerability-patched-in-sassy-social-share-plugin/
• https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39321