Vulnerability · Published Oct 29, 2026 · Assigned by ProgressSoftware
CVE-2026-90866Virtual Folder Path Confinement Bypass in Progress WS_FTP Server
Critical 9.1
In plain English
A critical-severity path traversal in WS_FTP Server from Progress Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.7%top 45.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A path traversal vulnerability in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow a delegated Host Administrator to access locations outside their authorized scope, potentially enabling remote code execution.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Progress Software | WS_FTP Server | 0 – before 2024.0.70 – before 2025.0.4 |
Weakness: CWE-22, CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H