# Duplicate Advisory: jupyter-server is vulnerable to CORS origin validation bypass when the \`allow_origin_pat\` configuration is used

Advisory record · `GHSA-v42x-x7jp-845h` · Withdrawn

- **Identifiers:** `GHSA-v42x-x7jp-845h` · `CVE-2026-6657` · `PYSEC-2026-3472`
- **State:** Withdrawn
- **Severity:** CVSS 6.1 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-346](https://cwe.mitre.org/data/definitions/346.html)
- **Tags:** [CWE-346](https://agentprime.io/advisories/tag/cwe-346.md)
- **Published:** 3 Jun 2026
- **Updated:** 31 Jul 2026
- **Reviewed by a person:** No

**Withdrawn.** The GitHub Advisory Database withdrew this advisory on 31 Jul 2026. The record stays here, marked withdrawn.

Published by the GitHub Advisory Database at 3 Jun 2026, 18:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `jupyter-server` (PyPI): affected `>=1.12.0, <=2.17.0`; no fixed version yet

## 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

- 6.1 Medium, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`, from CNA (@huntr_ai)

- **CISA KEV:** Not listed.
- **EPSS:** 0.052, the 92nd percentile, on 11 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-v42x-x7jp-845h)

## Sources

- [GitHub Advisory Database: GHSA-v42x-x7jp-845h](https://github.com/advisories/GHSA-v42x-x7jp-845h)
- [OSV: GHSA-v42x-x7jp-845h](https://osv.dev/vulnerability/GHSA-v42x-x7jp-845h)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-6657>
- <https://github.com/advisories/GHSA-v42x-x7jp-845h>
- <https://github.com/jupyter-server/jupyter_server>
- <https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2026-3472.yaml>
- <https://huntr.com/bounties/18f642db-3569-43b3-b58d-ff97be4b09d7>
- <https://pypi.org/project/jupyter-server>

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-v42x-x7jp-845h>, 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-v42x-x7jp-845h/>. Everything for agents: <https://agentprime.io/llms.txt>.