CVE-2026-90866

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductWS_FTP Server

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-22Path traversal CWE-434Unrestricted upload of dangerous file type

How to fix

Update

Progress Software WS_FTP Server2024.0.7, 2025.0.4 or later

Vendor advisories

progress.lightning.force.com/lightning/r/Knowledge__kav/ka7Pb000001vl86IAA/view

Affected products

Product	Affected versions	Fixed in
Progress Software WS_FTP Server	v < 2024.0.7, v < 2025.0.4	2024.0.7, 2025.0.4

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