CVE-2026-28413
Products.isurlinportal has possible open redirect when using more than 2 forward slashes
5.3
MEDIUM
CVSS 3.1
EPSS 0.01%
Description
Products.isurlinportal is a replacement for isURLInPortal method in Plone. Prior to versions 2.1.0, 3.1.0, and 4.0.0, a url /login?came_from=////evil.example may redirect to an external website after login. This issue has been patched in versions 2.1.0, 3.1.0, and 4.0.0.
How to fix CVE-2026-28413
To remediate CVE-2026-28413, upgrade the affected package to a fixed version below.
- —upgrade to 4.0.0 or later
- —upgrade to 2.1.0 or later
Is CVE-2026-28413 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 4.0.0a1, < 4.0.0
- from 0, < 2.1.0, >= 3.0.0, < 3.1.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |