https://www.wordfence.com/threat-intel/vulnerabilities/id/012946d4-82ce-48b9-9b9a-1fc49846dca6?source=cve
https://plugins.trac.wordpress.org/changeset/2983339/vk-filter-search#file1
https://plugins.trac.wordpress.org/browser/vk-filter-search/tags/2.3.1/inc/filter-search/package/class-vk-filter-search-shortcode.php#L40
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