What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-02 · updated 2026-06-17
• Weakness: CWE-601

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.

Affected products

• plone Products.isurlinportal: before 1.2.0 — fixed in 1.2.0

How to fix

Upgrade to a fixed version: plone Products.isurlinportal 1.2.0. Check the vendor advisory for mitigations.

References

• http://jvn.jp/en/jp/JVN50804280/index.html
• https://github.com/plone/Products.isurlinportal/commit/d4fd34990d18adf05a10dc5e2bb4b066798280ba
• https://github.com/plone/Products.isurlinportal/security/advisories/GHSA-q3m9-9fj2-mfwr
• http://jvn.jp/en/jp/JVN50804280/index.html
• https://github.com/plone/Products.isurlinportal/commit/d4fd34990d18adf05a10dc5e2bb4b066798280ba
• https://github.com/plone/Products.isurlinportal/security/advisories/GHSA-q3m9-9fj2-mfwr

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