Plesk
CVE-2020-11584
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 6.1 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, user interaction required. |
| Exploit ScenarioDerived | A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
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. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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. Affected products include: Plesk Onyx.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
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.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)NVD
Plesk Obsidian allows a CSRF attack, e.g., via the /api/v2/cli/commands REST API to change an Admin password. Rated medi
A Host Header Injection issue on the Login page of Plesk Obsidian through 18.0.49 allows attackers to redirect users to
The feature to preview a website in Plesk Obsidian 18.0.0 through 18.0.32 on Linux is vulnerable to reflected XSS via th
Cross-tenant credential disclosure in WebPros Plesk before 18.0.78.4 allows a low-privileged authenticated customer to e
SQL injection in the Plesk hosting control panel's XML-RPC API allows a remote, low-privileged authenticated user to inj
Privilege escalation in the Plesk web hosting control panel lets an authenticated low-privileged user abuse an improper
Authenticated remote attackers against WebPros Plesk (versions before 18.0.79.8, and 18.0.80 through 18.0.80.3) can inje
Arbitrary file write as root in Plesk's Backup Manager lets an authenticated customer escalate to full server compromise
Local privilege escalation to root affects the Backup Manager component of WebPros Plesk, where a time-of-check-to-time-
OS command injection in Plesk allows any authenticated low-privilege panel account - customer, reseller, or subscription
Privilege escalation to remote code execution in Plesk (18.0.52 through 18.0.79.6, and the 18.0.80.0 branch before 18.0.
Privilege escalation to root in Plesk for Linux (18.0.34 up to 18.0.79.9 / 18.0.80.5) lets a customer- or reseller-level
GitHub PoC
Exploit-DB