CVE-2026-90866 Virtual Folder Path Confinement Bypass in Progress WS_FTP Server
Critical 9.1
Published
Updated
Check this codebase for CVE-2026-90866 and fix it if it is affected.
What it is: CVE-2026-90866 is a critical vulnerability in Progress Software WS_FTP Server, published on 29 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-90866 in the wild and no public exploit code.
Affected product: Progress Software WS_FTP Server. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-90866/ (Markdown: https://insights.sbomify.com/CVE-2026-90866/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-90866?
CVE-2026-90866 is a critical vulnerability in Progress Software WS_FTP Server, published on 29 Oct 2026.
Official 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.
Which versions are affected by CVE-2026-90866?
How do I fix CVE-2026-90866?
No fix has been published for CVE-2026-90866 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-90866 being exploited?
There is no known exploitation of CVE-2026-90866 in the wild and no public exploit code.
Sources
Also known as GHSA-p4xx-h8r7-vfh5.