CVE-2021-21337
URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService
Description
Products.PluggableAuthService is a pluggable Zope authentication and authorization framework. In Products.PluggableAuthService before version 2.6.0 there is an open redirect vulnerability. A maliciously crafted link to the login form and login functionality could redirect the browser to a different website. The problem has been fixed in version 2.6.1. Depending on how you have installed Products.PluggableAuthService, you should change the buildout version pin to `2.6.1` and re-run the buildout, or if you used `pip` simply do `pip install "Products.PluggableAuthService>=2.6.1".
How to fix CVE-2021-21337
To remediate CVE-2021-21337, upgrade the affected package to a fixed version below.
- —upgrade to 2.6.1 or later
Is CVE-2021-21337 being exploited?
Moderate — EPSS is 8.4%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (1)
- from 0, < 2.6.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N |
References (7)
- ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21337
- PATCHgithub.com/zopefoundation/Products.PluggableAuthService
- WEBpacketstormsecurity.com/files/162911/Products.PluggableAuthService-2.6.0-Open-Redirect.html
- WEBgithub.com/pypa/advisory-database/tree/main/vulns/products-pluggableauthservice/PYSEC-2021-45.yaml