CVE-2021-21337: URL Redirection to Untrusted Site in Products.PluggableAuthService
Summary
CVE-2021-21337: URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService. Affects products-pluggableauthservice versions < 2.6.1. Fixed in 2.6.1. How to fix ↓
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Background
Products.PluggableAuthService is an open-source package available on PyPI. It provides a pluggable authentication service for web applications. This package allows developers to implement user authentication and authorization in their applications. However, a vulnerability has been discovered in Products.PluggableAuthService that allows for URL redirection to an untrusted site.
Vulnerability Detail
The vulnerability in Products.PluggableAuthService is an open redirect vulnerability. This means that a maliciously crafted link to the login form and login functionality could redirect the browser to a different website. An attacker could exploit this vulnerability to trick users into visiting a malicious site, potentially leading to further attacks such as phishing or malware installation.
How To Fix
Latest published version: 4.2.2 as of 23 Oct 2026
pip install --upgrade "products-pluggableauthservice==4.2.2"Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
2.6.1
This is the first release that contains the fix.
pip install --upgrade "products-pluggableauthservice==2.6.1"Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is recommended that users upgrade to the fixed version.
Conclusion
The vulnerability in Products.PluggableAuthService allows for URL redirection to an untrusted site, which can be exploited by attackers to trick users into visiting malicious websites. Users should upgrade to version 2.6.1 of Products.PluggableAuthService to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for products-pluggableauthservice →
FAQ
An open redirect vulnerability allows an attacker to redirect a user to a different website, potentially leading to further attacks.
The impact of this vulnerability is that users could be tricked into visiting a malicious website, which could result in further attacks such as phishing or malware installation.
Yes, the vulnerability has been fixed in version 2.6.1 of Products.PluggableAuthService.
To upgrade to the fixed version, change the buildout version pin to 2.6.1 and re-run the buildout. Alternatively, if pip was used for installation, run the command pip install "Products.PluggableAuthService>=2.6.1".
There is no known workaround for this vulnerability. It is recommended to upgrade to the fixed version.
References
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