---
title: "CVE-2026-105420: Wing FTP Server - Broken Access Control"
description: "Wing FTP Server before 8.2.6 contains a broken access control caused by improper verification of user's base folder, letting attackers with admin privileges add directories escaping the base folder, enabling file write and remote code execution as process owner."
url: https://panop.io/threat-heartbeat/CVE-2026-105420/
---

# CVE-2026-105420 Wing FTP Server - Broken Access Control

Wing FTP Server before 8.2.6 contains a broken access control caused by improper verification of user's base folder, letting attackers with admin privileges add directories escaping the base folder, enabling file write and remote code execution as process owner.

CVSS base score 9.4 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105420)

## Details

Type

Broken Access Control

Impact

Remote Code Execution, File System Write, Privilege Escalation

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Upgrade to version 8.2.6 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105420](https://nvd.nist.gov/vuln/detail/CVE-2026-105420)
- [https://cert.pl/en/posts/2026/10/CVE-2026-105420](https://cert.pl/en/posts/2026/10/CVE-2026-105420)
- [https://www.wftpserver.com/](https://www.wftpserver.com/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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