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High, CVSS 7.7amended

open-webui terminal proxy path traversal guard bypass via 9x encoded traversal

CVE-2026-59221GHSA-frvj-c5qp-xj4w

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (open-webui 0.10.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI open-webui

    Affected
    >= 0.9.6, < 0.10.0
    Fixed in
    0.10.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.7 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
EPSS
  • CVE-2026-59221: 0.48% estimated exploitation activity in the next 30 days; percentile 41.66 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

AI assistance was used to help inspect the code and prepare this report. Summary The fix for GHSA-r2wg-2mcr-66rv is incomplete in v0.9.6 and current main. backend/openwebui/routers/terminals.py documents sanitizeproxypath() as decoding until stable, but the implementation stops after 8 unquote() passes. A 9x percent-encoded ../... path parameter remains once-encoded after the loop, passes the posixpath.normpath() and cleaned.startswith('..') checks, and is forwarded to the configured terminal server. The upstream server then receives a decoded traversal path such as /base/../admin/system. Impact A user who has access to an admin-configured terminal connection can bypass the terminal proxy path traversal guard and cause Open WebUI to forward requests with the configured terminal credentials and X-User-Id header to paths outside the intended normalized proxy path. For orchestrator-backed terminal connections the same sanitized path is placed under /p/{policyid}/{safepath}, so the…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-frvj-c5qp-xj4w

  2. Revision 1 · created ·

    Published from osv record GHSA-frvj-c5qp-xj4w

Agent brief

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# Patch Next advisory brief: CVE-2026-59221

Advisory: open-webui terminal proxy path traversal guard bypass via 9x encoded traversal
IDs: CVE-2026-59221, GHSA-frvj-c5qp-xj4w
Record: https://patchnext.com/advisories/cve-2026-59221 (revision 2, source checked 26 Oct 2026, 13:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.10.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected >= 0.9.6, < 0.10.0; fixed in 0.10.0

## Suggested inspection (read-only)
- `python -m pip show open-webui`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on open-webui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-frvj-c5qp-xj4w (OSV record GHSA-frvj-c5qp-xj4w lists affected ranges: PyPI open-webui >=0.9.6 <0.10.0 (fixed))
- Verified: https://github.com/advisories/GHSA-frvj-c5qp-xj4w (GitHub-reviewed advisory GHSA-frvj-c5qp-xj4w lists affected ranges: PyPI open-webui >=0.9.6 <0.10.0)

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