How severe is CVE-2011-4777?

CVE-2011-4777 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-4777 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-2011-4777?

CVE-2011-4777 affects Parallels Parallels Plesk Panel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-4777?

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

When was CVE-2011-4777 published?

CVE-2011-4777 was published on 2011-12-16 and last updated on 2026-06-16.

CVE-2011-4777

CVE-2011-4777 is a medium-severity vulnerability in Parallels Parallels Plesk Panel with a CVSS 2.0 base score of 4.3. 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 2.0 base score 4.3)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Parallels Parallels Plesk Panel
Published: 2011-12-16
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in the Site Editor (aka SiteBuilder) feature in Parallels Plesk Panel 10.4.4_build20111103.18 allows remote attackers to inject arbitrary web script or HTML via the login parameter to preferences.html.

Frequently asked questions

What is CVE-2011-4777?: Cross-site scripting (XSS) vulnerability in the Site Editor (aka SiteBuilder) feature in Parallels Plesk Panel 10.4.4_build20111103.18 allows remote attackers to inject arbitrary web script or HTML via the login parameter to preferences.html.
How severe is CVE-2011-4777?: CVE-2011-4777 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-4777 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-2011-4777?: CVE-2011-4777 affects Parallels Parallels Plesk Panel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-4777?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4777 published?: CVE-2011-4777 was published on 2011-12-16 and last updated on 2026-06-16.

References

http://xss.cx/kb/parallels/xss-parallelspleskpanel.v10.4.4_build20111103.18-os_windows-2003-2008-reflected-cross-site-scripting-cwe79-capec86-javascript-injection-example-poc-report.html

Affected products (1)

cpe:2.3:a:parallels:parallels_plesk_panel:10.4.4_build20111103.18:*:*:*:*:*:*:*

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