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

Advisory record · `GHSA-frvj-c5qp-xj4w`

- **Identifiers:** `GHSA-frvj-c5qp-xj4w` · `CVE-2026-59221` · `PYSEC-2026-3597`
- **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:** 24 Jul 2026
- **Updated:** 4 Aug 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 24 Jul 2026, 21:05 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, <0.10.0`; fixed in `0.10.0`

## Machine-written summary

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

> Open WebUI (PyPI package open-webui) versions 0.9.6 up to but not including 0.10.0 are affected. A user with normal access to an admin-configured terminal connection can send a multiply percent-encoded path that bypasses the terminal proxy path traversal check, causing requests to be forwarded with the configured terminal credentials to paths outside the intended proxy path. Upgrade to open-webui 0.10.0 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:** 0.0048, the 42nd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:41 UTC: First seen by agentprime
- 31 Oct 2026, 14:41 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-frvj-c5qp-xj4w)

## Sources

- [GitHub Advisory Database: GHSA-frvj-c5qp-xj4w](https://github.com/advisories/GHSA-frvj-c5qp-xj4w)
- [OSV: GHSA-frvj-c5qp-xj4w](https://osv.dev/vulnerability/GHSA-frvj-c5qp-xj4w)
- <https://github.com/open-webui/open-webui/security/advisories/GHSA-frvj-c5qp-xj4w>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-59221>
- <https://github.com/open-webui/open-webui/pull/26050>
- <https://github.com/open-webui/open-webui/commit/05098d25a58d03738e01c4e85e8852c3b4ad849c>
- <https://github.com/open-webui/open-webui>
- <https://github.com/open-webui/open-webui/releases/tag/v0.10.0>

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-frvj-c5qp-xj4w>, 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-frvj-c5qp-xj4w/>. Everything for agents: <https://agentprime.io/llms.txt>.