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CriticalVulnerabilityCVE-2026-90865updated 29 Oct 2026, 16:20 UTC

WS_FTP Server on Windows can run attacker commands

A flaw in this file transfer server lets an outsider type commands that the server then runs on its computer. Those commands can run with high-level permissions, so an attacker could take over the machine.

Fix availableOfficial source
SeverityCriticalCVSS 9 of 10
Being exploited?UnclearNo reports either way yet
Fix available?YesVersion 2024.0.7 and 2025.0.4 (or later) · since 29 Oct 2026
How sure is this?Official sourceBacked by an official source

What happened

An OS command injection vulnerability in Progress Software WS_FTP Server on Windows allows arbitrary command execution with elevated privileges under certain configurations.

Why it is dangerous: An attacker who can exploit this could run any command on the server with elevated privileges, potentially gaining full control of the system and the files it holds. Organizations that use WS_FTP Server to exchange files are at risk.

Are you affected?

You are affected if you run WS_FTP Server on Windows at a version prior to 2024.0.7 or 2025.0.4, under the configurations the advisory describes.

Progress Software WS_FTP Server on Windows, versions prior to 2024.0.7 and prior to 2025.0.4

What to do

  1. Update WS_FTP Server to 2024.0.7 or 2025.0.4, or a later version.
  2. Review the server for signs of unexpected commands or new accounts, especially if it was exposed to the internet before patching.
  3. Restrict network access to the WS_FTP Server management and transfer interfaces to only the systems that need them.

Timeline

  1. 29 Oct 2026, 16:20 UTC
    Publicly disclosed
  2. 29 Oct 2026, 16:20 UTC
    Reported by NVD · NVD
  3. 29 Oct 2026, 16:20 UTC
    Picked up by Zero Radar

Sources 1 report, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-90865
CVSS
9 / 10
Disclosed
29 Oct 2026, 16:20 UTC
On Zero Radar
29 Oct 2026, 16:20 UTC (0 min after disclosure)
Last change
29 Oct 2026, 16:20 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

WS_FTP Server on Windows can run attacker commands · Zero Radar