# Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs

Advisory record · `GHSA-8x5v-cpv7-8jjp`

- **Identifiers:** `GHSA-8x5v-cpv7-8jjp` · `CVE-2026-70485` · `PYSEC-2026-3645`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 4 Aug 2026
- **Updated:** 10 Aug 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 4 Aug 2026, 19:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `open-webui` (PyPI): affected `>=0.9.0, <0.11.0`; fixed in `0.11.0`

## Machine-written summary

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

> Open WebUI versions 0.9.0 up to (but not including) 0.11.0 can be abused by any authenticated user to read internal or cloud-metadata responses. The server's check on fetched URLs misses IPv4 addresses wrapped in NAT64 IPv6 form, so this works only on networks with a NAT64 gateway. Upgrade to Open WebUI 0.11.0 or later; no configuration change is needed.

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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0035, the 29th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:40 UTC: First seen by agentprime
- 31 Oct 2026, 14:40 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8x5v-cpv7-8jjp)

## Sources

- [GitHub Advisory Database: GHSA-8x5v-cpv7-8jjp](https://github.com/advisories/GHSA-8x5v-cpv7-8jjp)
- [OSV: GHSA-8x5v-cpv7-8jjp](https://osv.dev/vulnerability/GHSA-8x5v-cpv7-8jjp)
- <https://github.com/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp>
- <https://github.com/open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3>
- <https://github.com/open-webui/open-webui>
- <https://github.com/open-webui/open-webui/releases/tag/v0.11.0>

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-8x5v-cpv7-8jjp>, 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-8x5v-cpv7-8jjp/>. Everything for agents: <https://agentprime.io/llms.txt>.