The redirect query parameter is appended to the base origin without validation, allowing attackers to steal access tokens via URL authority injection. This leads to full account takeover, as the attacker obtains the victim's access token and can impersonate them.
The application constructs the final redirect URL by concatenating the base origin with the user-supplied redirect parameter:
// https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/service.ts#L158C3-L176C4
const { redirect } = query;
...
session.redirect = redirect;
// https://github.com/feathersjs/feathers/blob/dove/packages/authentication-oauth/src/strategy.ts#L98
const redirectUrl = `${redirect}${queryRedirect}`;
Where:
- redirect = base origin from config (e.g., https://target.com)
- queryRedirect = user input from ?redirect= parameter
This is exploitable when the origins array is configured and origin values do not end with /. An attacker can supply @attacker.com as the redirect value results in https://[email protected]#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover.
Credits: Abdelwahed Madani Yousfi (@vvxhid) / Edoardo Geraci (@b0-n0-b0) / Thomas Rinsma (@ThomasRinsma) From Codean Labs.
| Score | Percentile |
|---|---|
| 0.01% | 1.12% |
| Base score | Version | Severity | Vector |
|---|---|---|---|
| 7.4 | 4.0 | — |
|
| Type | Value |
|---|---|
| GHSA | GHSA-ppf9-4ffw-hh4p ↗ |
| CVE | CVE-2026-27191 ↗ |
| CWE id | Name |
|---|---|
| CWE-601 | URL Redirection to Untrusted Site ('Open Redirect') |
Vulnerable version ranges and first patched releases as published by GitHub.
| Ecosystem | Package | Vulnerable range | First patched | Vulnerable functions |
|---|---|---|---|---|
| npm | @feathersjs/authentication-oauth | <= 5.0.39 | 5.0.40 | — |