What is CVE-2026-90871?

CVE-2026-90871 is a medium-severity vulnerability in Progress Software Ws FTP Server, classified under Path Traversal. CVSS score: 5.3/10. Published 2026-10-29.

How severe is CVE-2026-90871?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Path Traversal in Progress Software Ws FTP Server

CVE-2026-90871

Improper limitation of a pathname to a restricted directory in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow an unauthenticated attacker to affect files outside the intended directory.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-10-29 · last modified 2026-10-29.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Progress Software Ws FTP Server

Weakness classification (CWE)

References

progress.lightning.force.com/lightning/r/Knowledge__kav/ka7Pb000001vl86IAA/view (vendor-advisory)

Frequently asked questions

What is CVE-2026-90871?: CVE-2026-90871 is a medium-severity vulnerability in Progress Software Ws FTP Server, classified under Path Traversal. CVSS score: 5.3/10. Published 2026-10-29.
How severe is CVE-2026-90871?: Medium severity. CVSS v3 base score is 5.3 out of 10.