CVE-2021-21337

MEDIUM

Products.PluggableAuthService < 2.6.1 - Open Redirect via Login Form

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-21337. PoCs published by Piyush Patil.

AI-analyzed exploit summary This exploit demonstrates an open redirect vulnerability in Products.PluggableAuthService versions prior to 2.6.1. The 'came_from' parameter in the login process can be manipulated to redirect users to an attacker-controlled website.

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".

Exploits (1)

exploitdb WORKING POC
by Piyush Patil · textwebappspython
https://www.exploit-db.com/exploits/49930

This exploit demonstrates an open redirect vulnerability in Products.PluggableAuthService versions prior to 2.6.1. The 'came_from' parameter in the login process can be manipulated to redirect users to an attacker-controlled website.

Classification
Working Poc 90%
Attack Type
Other
Complexity
Trivial
Reliability
Reliable
Target: Products.PluggableAuthService < 2.6.1
No auth needed
Prerequisites: Access to the login page of the target application
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Scores

CVSS v3 5.7
EPSS 0.0180
EPSS Percentile 83.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Details

CWE
CWE-601
Status published
Products (2)
pypi/Products.PluggableAuthService 0 - 2.6.1PyPI
zope/products.pluggableauthservice < 2.6.1
Published Mar 08, 2021
Tracked Since Feb 18, 2026