CVE-2026-90863— Privilege Escalation via Missing Authorization in WS_FTP Manager

Quick assessment

Affected

Progress Software WS_FTP Server

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Windows 平台上，Progress Software WS_FTP Server 2024.0.7 和 2025.0.4 之前版本的行政接口中存在授权缺失漏洞。该漏洞可能允许被授权的托管管理员（Host Administrator）超出其授权范围，进而实现以高权限执行任意命令，最终导致底层服务器被完全攻陷。

CVSS 9.1 · Critical Updated Oct 30, 2026

Possible ATT&CK Techniques 3 AI

T1059 · Command and Scripting Interpreter T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client Execution

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Vulnerability Information

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Vulnerability Title

Privilege Escalation via Missing Authorization in WS_FTP Manager

Source: CVE Program / CVE List V5

Vulnerability Description

Missing authorization in the administrative interface of Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow a delegated Host Administrator to exceed their authorized scope, potentially enabling arbitrary command execution with elevated privileges and complete compromise of the underlying server.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

CWE-915

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Progress Software	WS_FTP Server	0 ~ 2024.0.7	-

II. Public POCs for CVE-2026-90863

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

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III. Intelligence Information for CVE-2026-90863

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Other References for CVE-2026-90863 (1)

https://progress.lightning.force.com/lightning/r/Knowledge__kav/ka7Pb000001vl86IAA/view vendor-advisory

https://www.cve.org/CVERecord?id=CVE-2026-90863

Same Patch Batch · Progress Software · 2026-10-29 · 15 CVEs total

CVE-2026-84295	10.0 CRITICAL	Improper Authentication in Progress WS_FTP Server
CVE-2026-90868	9.9 CRITICAL	OS Command Injection in Progress WS_FTP Server
CVE-2026-90864	9.1 CRITICAL	Host Administrator Path Containment Bypass in Progress WS_FTP Server
CVE-2026-90866	9.1 CRITICAL	Virtual Folder Path Confinement Bypass in Progress WS_FTP Server
CVE-2026-90865	9.0 CRITICAL	Command Injection via FTP Notification Variables in Progress WS_FTP Server
CVE-2026-90867	8.1 HIGH	Improper Access Control of Web Admin Console in Progress WS_FTP Server
CVE-2026-84294	7.7 HIGH	Information Disclosure in Ad Hoc Transfer in Progress WS_FTP Server
CVE-2026-90869	7.5 HIGH	Pre-Authentication SSH Denial of Service via Malformed Public-Key Signature in Progress WS
CVE-2026-84296	6.8 MEDIUM	SSH Multi-Factor Authentication Bypass in Progress WS_FTP Server
CVE-2026-90872	6.6 MEDIUM	Server-Side Script Injection in Manager Web UI in Progress WS_FTP Server
CVE-2026-90861	6.6 MEDIUM	Password Disclosure via Activity Logs Enabling Administrator Privilege Escalation in WS_FT
CVE-2026-90870	5.3 MEDIUM	Unauthenticated Ad Hoc Transfer Resource Exhaustion in Progress WS_FTP Server
CVE-2026-90871	5.3 MEDIUM	Path Traversal Leading to File Deletion in Ad Hoc Transfer and Web Transfer in Progress WS
CVE-2026-90862	4.3 MEDIUM	Web Transfer Module Multi-Factor Authentication Bypass in Progress WS_FTP Server

IV. Related Vulnerabilities

Same product: WS_FTP Server

Same vendor: Progress Software

Same weakness: CWE-915