See: https://urlquery.net/report/0278fa90-db30-42e2-a8bf-2be0ea593948
and https://aw-snap.info/file-viewer/?protocol=not-secure&tgt=www.emaltex.pl&ref_sel=GSP2&ua_sel=ff&fs=1
CMS WordPress Version
4.5.11
Version does not appear to be latest 4.8.3 - update now.
WordPress Plugins
The following plugins were detected by reading the HTML source of the WordPress sites front page.
woocommerce 2.5.5 latest release (3.2.3) Update required
https://woocommerce.com/
js_composer
google-analyticator 6.4.9.7 latest release (6.5.4) Update required
http://www.videousermanuals.com/google-analyticator/
wordpress-seo 4.9 latest release (5.7.1) Update required
https://yoast.com/wordpress/plugins/seo/
all-in-one-seo-pack 2.3.13.2 latest release (2.4.2) Update required
https://semperplugins.com/all-in-one-seo-pack-pro-version/
si-contact-form
sitemap 4.3 latest release (4.3)
http://wordpress.org/plugins/page-list/
Plugins are a source of many security vulnerabilities within WordPress installations, always keep them updated to the latest version available and check the developers plugin page for information about security related updates and fixes.
Retirable jQuery: http://retire.insecurity.today/#!/scan/7387dcf1e7452b78afa9106a7f85d886dbeee82484e10055020a1261f03beba6
F-grade status and recommendations: https://observatory.mozilla.org/analyze.html?host=www.emaltex.pl
Hosted: http://toolbar.netcraft.com/site_report?url=http://aav245.rev.netart.pl
polonus (volunteer website security analyst and website error-hunter)