SB20260428186 - Open redirect in isURLInPortal

Description

This security bulletin contains information about 1 vulnerability.

1) Open redirect (CVE-ID: CVE-2026-28413)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://github.com/plone/Products.isurlinportal/security/advisories/GHSA-43gx-6gv6-3jcp
• https://github.com/advisories/GHSA-43gx-6gv6-3jcp