Open redirect in isURLInPortal - CVE-2026-28413
Published: April 28, 2026
Vulnerability identifier: #VU128357
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-28413
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Plone
Affected software:
isURLInPortal
isURLInPortal
Detailed vulnerability description
The vulnerability allows a remote attacker to redirect users to an untrusted external website.
The vulnerability exists due to url redirection to an untrusted site in the login redirect handling in Products.isurlinportal when processing a crafted came_from parameter containing more than two forward slashes. A remote attacker can supply a specially crafted login URL to redirect users to an untrusted external website.
Only customized login flows, such as those modified by add-ons, are affected.
How to mitigate CVE-2026-28413
Install security update from vendor's website.