Insecure WordPress site with SSL issue (http/https?) F-status.

Website has cookie issues: https://webcookies.org/cookies/medklinika.spb.ru/7233338
F-status and recommended change: https://observatory.mozilla.org/analyze.html?host=medklinika.spb.ru
Accept Address Issue: http://www.dnsinspect.com/medklinika.spb.ru/10151985
Spaceweb issues risk: http://toolbar.netcraft.com/site_report?url=https%3A%2F%2Fmedklinika.spb.ru
Self-signed certificate installed, root installed on the server: Wrong certificate installed.
The domain name does not match the certificate common name or SAN.
The certificate has expired.
The certificate has expired. This server is not secure.
4 vulnerable libraries: http://retire.insecurity.today/#!/scan/8ed60cce8d44cec834660e713ae22068b70f7d7b18d40474b1e9ae99937d1309

WordPress Version
4.0.18
Version does not appear to be latest

all-in-one-seo-pack 2.2.7.5	latest release (2.3.13.2) Update required

https://semperplugins.com/all-in-one-seo-pack-pro-version/
wp-pagenavi 2.87 latest release (2.92) Update required
http://lesterchan.net/portfolio/programming/php/
contact-form-7 4.0.3 latest release (4.8) Update required
https://contactform7.com/
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.

Warning User Enumeration is possible
The first two user ID’s were tested to determine if user enumeration is possible.

ID User Login
1 None meduser
2 None vrach
It is recommended to rename the admin user account to reduce the chance of brute force attacks occurring. As this will reduce the chance of automated password attackers gaining access. However it is important to understand that if the author archives are enabled

Loaded resources OK.

polonus (volunteer website security analyst and website error-hunter)