URL Redirection to Untrusted Site ('Open Redirect') in Products.isurlinportal
Impact
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.
But the url https:example.org without slashes tricks our code and it 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 you to their site, especially as part of a phishing attack.
Patches
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.
Discovered
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:
- Email the Plone Security Team at security@plone.org, especially when you think you have discovered a security problem or when you are not sure.
- Open an issue in the tracker if your question or comment can be public.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | products-isurlinportal | < 1.2.0 | 1.2.0 |
References
- 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://nvd.nist.gov/vuln/detail/CVE-2021-32806
- https://github.com/plone/Products.isurlinportal
- https://github.com/pypa/advisory-database/tree/main/vulns/products-isurlinportal/PYSEC-2021-323.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N- Weakness (CWE)
CWE-601- Platform
- Python (PyPI)
- Package
products-isurlinportal- Disclosed
- 02.08.2021
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2021-323 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-q3m9-9fj2-mfwr - CC BY 4.0
Vulnerability history: products-isurlinportal
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 08.2021 03.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 1
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
-
URL Redirection to Untrusted Site ('Open Redirect') in Products.isurlinportal this entry
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