GHSA-q3m9-9fj2-mfwr is a medium-severity (CVSS 6.5) Open Redirect vulnerability in products-isurlinportal. O3 Security confirms whether GHSA-q3m9-9fj2-mfwr is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
URL Redirection to Untrusted Site ('Open Redirect') in Products.isurlinportal
Real-World Exposure
products-isurlinportalReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
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 [email protected], 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 Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | products-isurlinportal | all versions | 1.2.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for products-isurlinportal. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update products-isurlinportal to 1.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q3m9-9fj2-mfwr is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-q3m9-9fj2-mfwr is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-q3m9-9fj2-mfwr. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-q3m9-9fj2-mfwr in your dependencies?
O3 detects GHSA-q3m9-9fj2-mfwr across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.