An attacker can forge a request to redirect an authenticated user to any arbitrary website.
On the login page, we have a redirect
field which is the location where the server will redirect the user. This URI is not verified, and can be an arbitrary URI.
Paired with a parameter pollution, we can hide our malicious URI (ex: https://dns.com/?param1=im_hidden_if_theres_lot_of_args?param1=bbb
).
https://diracx-cert.app.cern.ch/auth?redirect=https://ipcim.com/en/where/?dsdsd=qsqsfsjfnsfniizaeiaapzqlalkqkaizqqijsjaopmqmxna?redirect=https://diracx-cert-app.cern.ch/auth
This POC can leak user's position.
This could be used for phishing and extracting new data (such as redirecting to a new "log in" page, and asking users to reenter credentials).
{ "github_reviewed": true, "severity": "MODERATE", "github_reviewed_at": "2025-07-17T19:40:59Z", "cwe_ids": [ "CWE-601" ], "nvd_published_at": "2025-07-17T15:15:27Z" }