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Back to active CVEs
Critical · CVSS 9.1CVE-2026-90866

Virtual Folder Path Confinement Bypass in Progress WS_FTP ServerCVE-2026-90866

Answer in brief

CVE-2026-90866 records a Critical severity (CVSS 9.1) vulnerability in Virtual Folder Path Confinement Bypass in Progress WS_FTP Server. The current sources do not mark it as known exploited. The current feed maps Progress Software/WS_FTP Server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 29, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Oct 29, 2026Material review Oct 29, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Progress Software/WS_FTP Server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Progress Software/WS_FTP Servergeneric>=0 <2024.0.7 || >=0 <2025.0.42024.0.7, 2025.0.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Progress Software/WS_FTP Server.
  2. 2Review the reported fix. Source-reported workaround: Limit delegation of Host Administrator privileges to trusted staff, and periodically audit virtual folder physical paths to confirm they remain within their assigned host root. Contact Progress Software Technical Support for guidance on available mitigations.

Evidence timeline and material changes

  1. Published upstream

    Oct 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 29, 2026

Sources and claim methodology

  • Source referenceprogress.lightning.force.com
Upstream source description

A path traversal vulnerability in Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could allow a delegated Host Administrator to access locations outside their authorized scope, potentially enabling remote code execution.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Pre-Authentication SSH Denial of Service via Malformed Public-Key Signature in Progress WS_FTP ServerSame progress software/ws_ftp server package
  • Unauthenticated Ad Hoc Transfer Resource Exhaustion in Progress WS_FTP ServerSame progress software/ws_ftp server package
  • Path Traversal Leading to File Deletion in Ad Hoc Transfer and Web Transfer in Progress WS_FTP ServerSame progress software/ws_ftp server package
  • Server-Side Script Injection in Manager Web UI in Progress WS_FTP ServerSame progress software/ws_ftp server package
  • Kubeflow: Unauthenticated path traversal to arbitrary file read on ml-pipeline-ui via the volume artifact sourceAlso CWE-22
  • Frappe before 15.121.0 and 16.x before 16.34.0 Path Traversal RCE via File UploadAlso CWE-22

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-22, CWE-434
Source
CVE List V5
Source checked
Oct 29, 2026
References
1 linked source
Open source record