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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXEzbTktOWZqMi1tZndy

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


Various parts of Plone use the 'is url in portal' check for security, mostly to see if it is safe to redirect to a url. A url like is not in the portal.
But the url without slashes tricks our code and it is considered to be in the portal.
When redirecting, some browsers go to, others give an error.
Attackers may use this to redirect you to their site, especially as part of a phishing attack.


The problem has been patched in Products.isurlinportal 1.2.0.
This is a recommended upgrade for all users of Plone 4.3 and 5, on Python 2.7 or higher.
It has not been tested on earlier Plone or Python versions.
Upcoming Plone 5.2.5 and higher will include the new version.


This vulnerability was discovered and reported by Yuji Tounai of Mitsui Bussan Secure Directions, Inc. Thank you!

For more information

If you have any questions or comments about this advisory:

Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: almost 3 years ago
Updated: over 1 year ago

CVSS Score: 6.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Identifiers: GHSA-q3m9-9fj2-mfwr, CVE-2021-32806
References: Repository:
Blast Radius: 0.0

Affected Packages

Dependent packages: 1
Dependent repositories: 1
Downloads: 9,857 last month
Affected Version Ranges: < 1.2.0
Fixed in: 1.2.0
All affected versions: 1.0.0, 1.1.0, 1.1.1
All unaffected versions: 1.2.0, 1.2.1, 2.0.0, 2.0.1, 2.0.2