How severe is CVE-2020-11584?

CVE-2020-11584 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-2020-11584 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-11584?

CVE-2020-11584 affects Plesk Onyx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-11584?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-11584 published?

CVE-2020-11584 was published on 2020-08-03 and last updated on 2026-06-17.

CVE-2020-11584

CVE-2020-11584 is a medium-severity vulnerability in Plesk Onyx 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% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Plesk Onyx
Published: 2020-08-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2020-11584?: 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.
How severe is CVE-2020-11584?: CVE-2020-11584 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-2020-11584 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-11584?: CVE-2020-11584 affects Plesk Onyx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-11584?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-11584 published?: CVE-2020-11584 was published on 2020-08-03 and last updated on 2026-06-17.

References

https://medium.com/%400x00crash/xss-reflected-in-plesk-onyx-and-obsidian-1173a3eaffb5

Affected products (1)

cpe:2.3:a:plesk:onyx:17.8.11:*:*:*:*:*:*:*

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