Uncontrolled search path element vulnerability in Plesk Installer affects version 3.27.0.0. A local attacker could execute arbitrary code by injecting DLL files into the same folder where the application is installed, resulting in DLL hijacking in edputil.dll, samlib.dll, urlmon.dll, sspicli.dll, propsys.dll and profapi.dll files.

Plesk Onyx 17.8.11 has accessKeyId and secretAccessKey fields that are related to an Amazon AWS Firehose component. NOTE: the vendor's position is that there is no security threat.

Plesk 17.0 through 18.0.31 version, is vulnerable to a Cross-Site Scripting. A malicious subscription owner (either a customer or an additional user), can fully compromise the server if an administrator visits a certain page in Plesk related to the malicious subscription.

A Host Header Injection issue on the Login page of Plesk Obsidian through 18.0.49 allows attackers to redirect users to malicious websites via a Host request header. NOTE: the vendor's position is "the ability to use arbitrary domain names to access the panel is an intended feature."

Plesk Obsidian allows a CSRF attack, e.g., via the /api/v2/cli/commands REST API to change an Admin password. NOTE: Obsidian is a specific version of the Plesk product: version numbers were used through version 12, and then the convention was changed so that versions are identified by names ("Obsidian"), not numbers.

Plesk CMS 18.0.37 is affected by an insecure permissions vulnerability that allows privilege Escalation from user to admin rights. OTE: the vendor states that this is only a site-specific problem on websites of one or more Plesk users

Plesk 18.0.37 is affected by a Cross Site Request Forgery (CSRF) vulnerability that allows an attacker to insert data on the user and admin panel. NOTE: the vendor states that this is only a site-specific problem on websites of one or more Plesk users

The feature to preview a website in Plesk Obsidian 18.0.0 through 18.0.32 on Linux is vulnerable to reflected XSS via the /plesk-site-preview/ PATH, aka PFSI-62467. The attacker could execute JavaScript code in the victim's browser by using the link to preview sites hosted on the server. Authentication is not required to exploit the vulnerability.

A GET-based XSS reflected vulnerability in Plesk Obsidian 18.0.17 allows remote unauthenticated users to inject arbitrary JavaScript, HTML, or CSS via a GET parameter.

A GET-based XSS reflected vulnerability in Plesk Onyx 17.8.11 allows remote unauthenticated users to inject arbitrary JavaScript, HTML, or CSS via a GET parameter.