CVE-2021-35976

Name: CVE-2021-35976
Creator: NVD / NIST
Published: 2021-09-10T12:15:13.193+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.11%

Last modified Jun 17, 2026

CVE-2021-35976 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 1.11% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.11%

61.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Plesk	Obsidian	>= 18.0.0, <= 18.0.32

References

https://support.plesk.com/hc/en-us/articles/4402990507026Vendor Advisory
https://tarekbouali.com/cves/cve-2021-35976Exploit, Third Party Advisory
https://www.bouali.io/cves/cve-2021-35976Broken Link
https://support.plesk.com/hc/en-us/articles/4402990507026Vendor Advisory
https://tarekbouali.com/cves/cve-2021-35976Exploit, Third Party Advisory
https://www.bouali.io/cves/cve-2021-35976Broken Link

Timeline

Published: Sep 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35976?

How severe is CVE-2021-35976?

CVE-2021-35976 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.11% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35976?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35976?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST