The Control Panel in Parallels Plesk Panel 10.4.4_build20111103.18 sends incorrect Content-Type headers for certain resources, which might allow remote attackers to have an unspecified impact by leveraging an interpretation conflict involving admin/health/parameters and certain other files. NOTE: it is possible that only clients, not the Plesk product, could be affected by this issue.
Conclusion & alert: CVE-2011-4856 is rated Moderate Risk (64.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.76%). Core evidence: EPSS rose +1.01% over the last day, indicating growing attacker interest. Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.75% | 1.76% | +1.01% |
| 2 | 2026-01-20 | 0.73% | 0.75% | +0.02% |
| 3 | 2025-03-30 | — | 0.73% | — |
Full EPSS history (8 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| parallels | parallels_plesk_panel | 10.4.4_build20111103.18 | cpe:2.3:a:parallels:parallels_plesk_panel:10.4.4_build20111103.18:*:*:*:*:*:*:* |