CVE-2021-21337

URL Redirection to Untrusted Site ('Open Redirect') in Products.PluggableAuthService

MEDIUM
6.1
CVSS Score
Published: March 8, 2021 at 09:10 PM UTC
Updated: June 17, 2026 at 03:35 AM UTC
2 products affected across 2 vendorsProducts.pluggableauthserviceProducts.PluggableAuthService

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Severity
MEDIUM6.1
Exploit prediction
EPSS 8%

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".

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.6.1
Affected range stops below 2.6.1, so it looks safe — our inference, not a vendor statement
v < 2.6.1
Affected range stops below 2.6.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-601

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