Hi Julien72,

Eddy has sketched some issues that you now seem to have mitigated, there are still some issues to look into or report to the hosting of that website.

Some advice to enhance website security for this site: https://observatory.mozilla.org/analyze.html?host=www.camping-les-mimosas.com F-status and recommendations. (site can be accidentaly been visited over http:// ).

Consider: http://www.domxssscanner.com/scan?url=https%3A%2F%2Fwww.camping-les-mimosas.com
For wowslider:

Results from scanning URL: -https://www.camping-les-mimosas.com/js/menu/menu.js
Number of sources found: 37
Number of sinks found: 11

Detected errors

error: line:15: SyntaxError: missing ) after condition:
error: line:15: t+n.left}if(z.top<n.top){y-=z.top+n.top}var v=(n.left+n.width)-z.left-q/c;if(0>v){A+=v}var t=(n.top+n.height)-z.top-o/k;if(0>t){y+=t}}else{var A=qw/c;var y=ou/k}d(this).find(“img”).css({left:-(qw/c)+“px”,top:-(ou/k)+“px”,width:q+“px”,height:o+“px”}
error: line:15: …^
anti-evasion obfuscated adware script with fingerprinting risks. This should be taken up with those responsible for the code of javascript obfuscator at http://javascript-source.com/ (remarks by me, polonus)

Cert. with errors: wXw.camping-les-mimosas.com
You have 1 error
Wrong certificate installed.
The domain name does not match the certificate common name or SAN.
Warnings
Root installed on the server.
For best practices, remove the self-signed root from the server.
Plesk ns321609.ip-37-187-3.eu → http://toolbar.netcraft.com/site_report?url=ns321609.ip-37-187-3.eu

DNS report issues: FAIL: While quering domain’s records, some of your name servers didn’t responded. Name servers which didn’t responded:
udp4:213.186.33.199
udp6:2001:41d0:8:2b87::

WARNING: We found different serial numbers on your name servers, it’s OK if you had modified your zone recently.
2001:41d0:8:2b87::: 0
213.186.33.199: 0
37.187.3.197: 2017070603
Having different serials on your name servers may show inconsistencies between name servers configuration (multiple masters), or communication errors (ACL and firewall issues).

Some of these issues are hosting related and should be taken up with tech@ovh.net

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