Medium severity · published Mar 5, 2026
CVE-2026-28413
Products.isurlinportal: Possible open redirect when using more than 2 forward slashes
6.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PR
Products.isurlinportal · plone
< 4.0.0; < 3.1.0; < 2.1.0 · source: vendor
IS
Isurlinportal · Plone
before 2.1.0; 3.0.0 before 3.1.0; 4.0.0 · source: NVD