CVE-2021-35976
CVE-2021-35976 is a medium-severity vulnerability in Plesk Obsidian with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (63rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Plesk Obsidian
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-35976?
- 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.
- How severe is CVE-2021-35976?
- CVE-2021-35976 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2021-35976 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-35976?
- CVE-2021-35976 affects Plesk Obsidian. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-35976?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-35976 published?
- CVE-2021-35976 was published on 2021-09-10 and last updated on 2026-06-17.
References
- https://support.plesk.com/hc/en-us/articles/4402990507026
- https://tarekbouali.com/cves/cve-2021-35976
- https://www.bouali.io/cves/cve-2021-35976
Affected products (1)
- cpe:2.3:a:plesk:obsidian:*:*:*:*:*:*:*:*
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