CVE-2026-90870 PUBLISHED

Unauthenticated Ad Hoc Transfer Resource Exhaustion in Progress WS_FTP Server

Assigner: ProgressSoftware
Reserved: 14.09.2026 Published: 29.10.2026 Updated: 29.10.2026

A missing release of backend receiver sessions in the Ad Hoc Transfer component of Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could lead to server resource exhaustion and service degradation.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS Score: 5.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	Progress Software
Product	WS_FTP Server
Versions	Default: unaffected affected from 0 to 2024.0.7 (excl.) affected from 0 to 2025.0.4 (excl.)

Workarounds

Shorten the XFT session timeout where practical, and restrict the Ad Hoc Transfer endpoint to trusted networks if external access is not required. Contact Progress Software Technical Support for guidance on available mitigations.

Credits

Niv Levy (restricted) finder

References

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

Problem Types

CWE-400: Uncontrolled Resource Consumption CWE
CWE-772: Missing Release of Resource after Effective Lifetime CWE

Impacts

Excessive Allocation - repeated unauthenticated requests retain backend sessions and cause resource exhaustion and service degradation