---
id: "CVE-2026-90862"
kind: "vulnerability"
aliases: ["CVE-2026-90862"]
title: "WS_FTP Server: Web Transfer flaw skips multi-factor authentication on Windows"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["file-transfer", "vendor", "windows", "ws_ftp"]
not_affected_if: ["fixed-version", "non-windows", "web-transfer-disabled"]
published_at: "2026-10-29T16:20:04+00:00"
first_seen_at: "2026-10-29T16:26:01+00:00"
updated_at: "2026-10-29T16:31:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90862", "first_seen_at": "2026-10-29T16:26:01+00:00"}]
---

# WS_FTP Server: Web Transfer flaw skips multi-factor authentication on Windows

Progress WS_FTP Server's Web Transfer Module, on Windows, fails to enforce multi-factor authentication for some file access. An attacker who already has a user's password can reach files tied to that account without the second factor.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed WS_FTP Server version and compare it with the fixed releases `2024.0.7` and `2025.0.4`.
- Confirm the server runs on Windows and that the Web Transfer Module is in use.
- Check whether MFA is required for the affected accounts.

## Fix

- WS_FTP Server prior to `2024.0.7` on the 2024.0 line: move to `2024.0.7`.
- WS_FTP Server prior to `2025.0.4` on the 2025.0 line: move to `2025.0.4`.

## Timeline

- 2026-10-29T16:26:01+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-90862

## From the sources

Improper authentication in the Web Transfer Module of Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow an attacker with a user’s password to access certain files associated with that account without satisfying multi-factor authentication requirements.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_