Open WebUI: Path traversal / SSRF in terminal server proxy via encoded path traversal

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-2026-54017: 0.52% estimated exploitation activity in the next 30 days; percentile 44.35 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The terminal-server reverse proxy in backend/openwebui/routers/terminals.py does not fully confine the user-controlled path segment before forwarding it to an admin-configured terminal server. An authenticated user who has been granted access to a terminal server can craft path values containing encoded ../ traversal sequences that escape the intended path (or policy) scope on that server, reaching unintended endpoints and files on the terminal-server host. Where the terminal server fans requests out to internal services, this also gives SSRF-style reach into those services. This is a separate code path from the /api/v1/retrieval/process/web SSRF (GHSA-c6xv-rcvw-v685), with its own input. Two distinct vectors are consolidated here: 1. Raw path forwarding / single-encoded traversal (original report). 2. A bypass of the subsequently-added sanitizeproxypath mitigation using double-encoded dots (%252e%252e). The attacker-controlled input is the request path, supplied by the…

Published by the source

17 Jun 2026, 17:55 UTC

Last modified by the source

15 Jul 2026, 22:00 UTC

Source last checked

26 Oct 2026, 13:46 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-r2wg-2mcr-66rv

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-r2wg-2mcr-66rv

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# Patch Next advisory brief: CVE-2026-54017

Advisory: Open WebUI: Path traversal / SSRF in terminal server proxy via encoded path traversal
IDs: CVE-2026-54017, GHSA-r2wg-2mcr-66rv
Record: https://patchnext.com/advisories/cve-2026-54017 (revision 2, source checked 26 Oct 2026, 13:46 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 0.9.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected <= 0.9.5; fixed in 0.9.6

## 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-r2wg-2mcr-66rv (OSV record GHSA-r2wg-2mcr-66rv lists affected ranges: PyPI open-webui >=0 <0.9.6 (fixed))
- Verified: https://github.com/advisories/GHSA-r2wg-2mcr-66rv (GitHub-reviewed advisory GHSA-r2wg-2mcr-66rv lists affected ranges: PyPI open-webui >=0 <=0.9.5)

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