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 ↗

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

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

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