Session fixation vulnerability in Virtual Hosting Control System (VHCS) 2.4.7.1 and earlier allows remote attackers to hijack web sessions by setting the PHPSESSID parameter.
Conclusion & alert: CVE-2007-3988 is rated Moderate Risk (55.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.45%). 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 | 2026-05-05 | 1.18% | 1.45% | +0.27% |
| 2 | 2026-03-13 | 0.88% | 1.18% | +0.29% |
| 3 | 2025-10-09 | — | 0.88% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| virtual_hosting_control_system | virtual_hosting_control_system | <= 2.4.7.1 | cpe:2.3:a:virtual_hosting_control_system:virtual_hosting_control_system:*:*:*:*:*:*:*:* |