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

Advisory record · `GHSA-r2wg-2mcr-66rv`

- **Identifiers:** `GHSA-r2wg-2mcr-66rv` · `CVE-2026-54017` · `PYSEC-2026-2751`
- **State:** Confirmed
- **Severity:** CVSS 7.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-22](https://cwe.mitre.org/data/definitions/22.html) · [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Path traversal](https://agentprime.io/advisories/tag/path-traversal.md) · [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 17 Jun 2026
- **Updated:** 15 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 Jun 2026, 17:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `open-webui` (PyPI): affected `<0.9.6`; fixed in `0.9.6`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Open WebUI versions before 0.9.6 are vulnerable to path traversal in the terminal server reverse proxy, where the user-supplied path is not fully confined before being forwarded to an admin-configured terminal server. An authenticated non-admin user who has been granted access to a terminal server can use encoded traversal sequences, including a double-encoded bypass of the path sanitizer, to reach unintended endpoints and files on that server and possibly internal services it routes to. Upgrade to Open WebUI 0.9.6 or later.

Written 5 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.7 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0042, the 36th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:42 UTC: First seen by agentprime
- 31 Oct 2026, 14:42 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-r2wg-2mcr-66rv)

## Sources

- [GitHub Advisory Database: GHSA-r2wg-2mcr-66rv](https://github.com/advisories/GHSA-r2wg-2mcr-66rv)
- [OSV: GHSA-r2wg-2mcr-66rv](https://osv.dev/vulnerability/GHSA-r2wg-2mcr-66rv)
- <https://github.com/open-webui/open-webui/security/advisories/GHSA-r2wg-2mcr-66rv>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-54017>
- <https://github.com/open-webui/open-webui>
- <https://github.com/pypa/advisory-database/tree/main/vulns/open-webui/PYSEC-2026-2751.yaml>
- <https://pypi.org/project/open-webui>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-r2wg-2mcr-66rv>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-r2wg-2mcr-66rv/>. Everything for agents: <https://agentprime.io/llms.txt>.