CVE-2021-32806 URL Redirection to Untrusted Site ('Open Redirect') in Products.isurlinportal

What is CVE-2021-32806?

CVE-2021-32806 is a medium-severity vulnerability in plone Products.isurlinportal, published on 2 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Products.isurlinportal is a replacement for isURLInPortal method in Plone. Versions of Products.isurlinportal prior to 1.2.0 have an Open Redirect vulnerability. 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 `https://example.org` is not in the portal. The url `https:example.org` without slashes is considered to be in the portal. When redirecting, some browsers go to `https://example.org`, others give an error. Attackers may use this to redirect victims to their site, especially as part of a phishing attack. The problem has been patched in Products.isurlinportal 1.2.0.

Weakness: CWE-601

Which versions are affected by CVE-2021-32806?

3 open source packages ship an affected version, including Products.isurlinportal and products-isurlinportal. It affects 1 product.

Products include Plone Isurlinportal.

How do I fix CVE-2021-32806?

Upgrade Products.isurlinportal to 1.2.0 or later.

Is CVE-2021-32806 being exploited?

There is no known exploitation of CVE-2021-32806 in the wild and no public exploit code.

Other vulnerabilities in plone Products.isurlinportal

• CVE-2026-28413 Products.isurlinportal: Possible open redirect when using more than 2 forward slashes Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-q3m9-9fj2-mfwr, PYSEC-2021-323.