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CVE-2023-40045: WS_FTP Server Ad Hoc Transfer Module Reflected Cross-Site Scripting Vulnerability

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-27 · updated 2026-06-17
• Weakness: CWE-79

Description

In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a reflected cross-site scripting (XSS) vulnerability exists in WS_FTP Server's Ad Hoc Transfer module.  An attacker could leverage this vulnerability to target WS_FTP Server users with a specialized payload which results in the execution of malicious JavaScript within the context of the victims browser.

Affected products

• Progress Software Corporation WS_FTP Server: before 8.7.4; from 8.8 before 8.8.2 — fixed in 8.7.4, 8.8.2

How to fix

Upgrade to a fixed version: Progress Software Corporation WS_FTP Server 8.7.4, 8.8.2. Check the vendor advisory for mitigations.

References

• https://community.progress.com/s/article/WS-FTP-Server-Critical-Vulnerability-September-2023
• https://www.progress.com/ws_ftp
• https://community.progress.com/s/article/WS-FTP-Server-Critical-Vulnerability-September-2023
• https://www.progress.com/ws_ftp

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