What is CVE-2026-90863?

CVE-2026-90863 is a critical-severity vulnerability, classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-10-29.

How severe is CVE-2026-90863?

Critical severity. CVSS v3 base score is 9.1 out of 10.

CVE-2026-90863

CVE-2026-90863

Missing authorization in the administrative interface of Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow a delegated Host Administrator to exceed their authorized scope, potentially enabling arbitrary command execution with elevated privileges and complete compromise of the underlying server.

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

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.

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2026-90863?: CVE-2026-90863 is a critical-severity vulnerability, classified under Missing Authorization. CVSS score: 9.1/10. Published 2026-10-29.
How severe is CVE-2026-90863?: Critical severity. CVSS v3 base score is 9.1 out of 10.