What is CVE-2026-28413?

CVE-2026-28413 is a medium-severity vulnerability in Plone Isurlinportal, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.3/10. Published 2026-03-05.

How severe is CVE-2026-28413?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Open Redirect in Plone Isurlinportal

CVE-2026-28413

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.

Vulnerability class: Open Redirect

EPSS: 0.002 (13.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Plone Isurlinportal — versions 4.0.0
Plone Products.isurlinportal — versions < 4.0.0, < 3.1.0, < 2.1.0

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28413?: CVE-2026-28413 is a medium-severity vulnerability in Plone Isurlinportal, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.3/10. Published 2026-03-05.
How severe is CVE-2026-28413?: Medium severity. CVSS v3 base score is 5.3 out of 10.