CVE-2023-28370: Open redirect in Tornado

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-25 · updated 2026-06-17
Weakness: CWE-601

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.

Affected products

tornadoweb tornado: before 6.3.2 — fixed in 6.3.2
Pypi Tornado: before 6.3.2; 0.2, 1.0, 1.1, 1.1.1, 1.2, 1.2.1 (+62) — fixed in 6.3.2

How to fix

Upgrade to a fixed version: tornadoweb tornado 6.3.2; Pypi Tornado 6.3.2. Check the vendor advisory for mitigations.

References

https://github.com/tornadoweb/tornado/releases/tag/v6.3.2
https://jvn.jp/en/jp/JVN45127776/
https://github.com/tornadoweb/tornado/releases/tag/v6.3.2
https://jvn.jp/en/jp/JVN45127776/
https://lists.debian.org/debian-lts-announce/2025/01/msg00000.html

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