Quick answers
- Is CVE-2026-90871 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-90871 being exploited in the wild.
- How severe is CVE-2026-90871?
- Medium severity, with a CVSS score of 5.3, published 29 October 2026.
- Which products and versions are affected?
- Progress Software WS FTP Server prior to 2024.0.7 and 2025.0.4.
- Is there a fix for CVE-2026-90871?
- Yes: fixed in WS_FTP Server 2024.0.7, 2025.0.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-90871 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-90871?
- Check whether you run Progress Software WS FTP Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: WS_FTP Server 2024.0.7, 2025.0.4
Technical details
An improper pathname restriction flaw in WS_FTP Server allows unauthenticated remote attackers to traverse outside the intended FTP directory hierarchy. The vulnerability stems from inadequate validation of file path inputs, enabling unauthorized access to arbitrary files on the affected Windows system without requiring authentication.
Affected products
- Progress Software WS_FTP Server prior to 2024.0.7 and 2025.0.4
Timeline
- 2026-10-29: disclosed