CVE-2021-35976: Plesk Obsidian

Medium severity, CVSS 6.1. EPSS: 1.1% chance of exploitation in the next 30 days.

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.

Affected products

• Plesk Obsidian: from 18.0.0, up to and including 18.0.32

Published 2021-09-10. Last modified 2026-06-17.