CVE-2026-28413: Products.isurlinportal has possible open redirect when using more than 2 forward slashes

March 2, 2026 (updated March 5, 2026)

A url /login?came_from=////evil.example may redirect to an external website after login.

Standard Plone is not affected, but if you have customised the login, for example with add-ons, you might be affected. You can try the url to check if you are affected or not.

References

github.com/advisories/GHSA-43gx-6gv6-3jcp
github.com/plone/Products.isurlinportal
github.com/plone/Products.isurlinportal/security/advisories/GHSA-43gx-6gv6-3jcp
nvd.nist.gov/vuln/detail/CVE-2026-28413

Code Behaviors & Features

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