Path Traversal Vulnerability in Progress Software WS_FTP Server
CVE-2026-90866

9.1CRITICAL

Key Information:

Vendor

Progress Software
Status
Ws Ftp Server
Vendor
CVE Published:
29 October 2026

What is CVE-2026-90866?

A path traversal vulnerability exists in Progress Software WS_FTP Server, affecting versions prior to 2024.0.7 and 2025.0.4 on Windows. This flaw could allow a delegated Host Administrator to bypass directory restrictions, potentially leading to unauthorized access to file system locations outside their intended scope. If exploited, this vulnerability may enable an attacker to execute remote code, posing significant risks to system integrity and security.

Affected Version(s)

WS_FTP Server Windows 0 < 2024.0.7

WS_FTP Server Windows 0 < 2025.0.4

References

https://progress.lightning.force.com/lightning/r/Knowledg...
vendor-advisory

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Niv Levy (restricted)
.