Vulnerability · Published Feb 21, 2026 · Assigned by GitHub_M
CVE-2026-27191Feathers: Open Redirect in OAuth callback enables account takeover
High 7.4
In plain English
A high-severity open redirect in feathers from feathersjs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. Versions 5.0.39 and below 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. 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://target.com@attacker.com#access_token=..., where the browser interprets attacker.com as the host, leading to full account takeover. This issue has been fixed in version 5.0.40.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @feathersjs/authentication-oauth | 5.0.40 | GHSA-ppf9-4ffw-hh4p |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| feathersjs | feathers | < 5.0.40 |
Weakness: CWE-601 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N