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9.3

OAuth callback in Feathers allows unauthorized account takeover

CVE-2026-29792 GHSA-wg9x-qfgw-pxhj GHSA-wg9x-qfgw-pxhj
Summary

An attacker can gain access to any Feathers account by sending a specially crafted request. This means someone could take control of an account without needing a password. Users and administrators should update Feathers immediately to the latest version to fix this issue.

What to do
  • Update feathersjs authentication-oauth to version 5.0.42.
  • Update feathersjs @feathersjs/authentication-oauth to version 5.0.42.
Affected software
VendorProductAffected versionsFix available
feathersjs authentication-oauth > 5.0.0 , <= 5.0.41 5.0.42
feathersjs @feathersjs/authentication-oauth > 5.0.0 , <= 5.0.42 5.0.42
Original title
Feathers has an OAuth Callback Account Takeover issue
Original description
An unauthenticated attacker can send a crafted GET request directly to `/oauth/:provider/callback` with a forged profile in the query string. The OAuth service's authentication payload has a fallback chain that reaches params.query (the raw request query) when Grant's session/state responses are empty. Since the attacker never initiated an OAuth authorize flow, Grant has no session to work with and produces no response, so the fallback fires. The forged profile then drives entity lookup and JWT minting. The attacker gets a valid access token for an existing user without ever contacting the OAuth provider. Critical (CVSS 9.8)
nvd CVSS4.0 9.3
Vulnerability type
CWE-287 Improper Authentication
Published: 10 Mar 2026 · Updated: 13 Mar 2026 · First seen: 10 Mar 2026