What is CVE-2021-32645?

CVE-2021-32645 is a medium-severity vulnerability in Tenancy Multi-Tenant, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-05-27.

How severe is CVE-2021-32645?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Tenancy Multi-Tenant

CVE-2021-32645

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.

Vulnerability class: Open Redirect

Published 2021-05-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Tenancy Multi-Tenant — versions >=5.6.0, < 5.7.2

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

github.com/tenancy/multi-tenant/security/advisories/GHSA-4r8q-gv9j-3xx6 (Third Party Advisory, Mitigation)
github.com/tenancy/multi-tenant/commit/9c837a21bccce9bcaeb90033ef200d84f0d9e164 (Patch, Third Party Advisory)
packagist.org/packages/hyn/multi-tenant (Product, Third Party Advisory)
webmasters.googleblog.com/2009/01/open-redirect-urls-is-your-site-being.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-32645?: CVE-2021-32645 is a medium-severity vulnerability in Tenancy Multi-Tenant, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-05-27.
How severe is CVE-2021-32645?: Medium severity. CVSS v3 base score is 6.1 out of 10.