CVE-2011-4855
CVE-2011-4855 is a critical-severity vulnerability in Parallels Parallels Plesk Panel with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Critical (CVSS 2.0 base score 9.3)
- EPSS exploit prediction: 2% (75th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Parallels Parallels Plesk Panel
- Published:
- Last modified:
Description
The Control Panel in Parallels Plesk Panel 10.4.4_build20111103.18 omits the Content-Type header's charset parameter for certain resources, which might allow remote attackers to have an unspecified impact by leveraging an interpretation conflict involving admin/customer-service-plan/list/reset-search/true/ and certain other files. NOTE: it is possible that only clients, not the Plesk product, could be affected by this issue.
Frequently asked questions
- What is CVE-2011-4855?
- The Control Panel in Parallels Plesk Panel 10.4.4_build20111103.18 omits the Content-Type header's charset parameter for certain resources, which might allow remote attackers to have an unspecified impact by leveraging an interpretation conflict involving admin/customer-service-plan/list/reset-search/true/ and certain other files. NOTE: it is possible that only clients, not the Plesk product, could be affected by this issue.
- How severe is CVE-2011-4855?
- CVE-2011-4855 has a CVSS 2.0 base score of 9.3, rated critical severity.
- Is CVE-2011-4855 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2011-4855?
- CVE-2011-4855 affects Parallels Parallels Plesk Panel. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2011-4855?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2011-4855 published?
- CVE-2011-4855 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
- https://exchange.xforce.ibmcloud.com/vulnerabilities/72092
Affected products (1)
- cpe:2.3:a:parallels:parallels_plesk_panel:10.4.4_build20111103.18:*:*:*:*:*:*:*
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