Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From 5.0.0 to before 5.0.42, 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. This vulnerability is fixed in 5.0.42.
Metrics
Affected Vendors & Products
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History
Wed, 11 Mar 2026 15:15:00 +0000
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ssvc
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Wed, 11 Mar 2026 12:00:00 +0000
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Feathersjs
Feathersjs authentication-oauth Feathersjs feathers |
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Feathersjs
Feathersjs authentication-oauth Feathersjs feathers |
Tue, 10 Mar 2026 20:15:00 +0000
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| Description | Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or JavaScript. From 5.0.0 to before 5.0.42, 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. This vulnerability is fixed in 5.0.42. | |
| Title | Feathersjs has an OAuth Callback Account Takeover | |
| Weaknesses | CWE-287 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-03-11T14:10:22.938Z
Reserved: 2026-03-04T16:26:02.900Z
Link: CVE-2026-29792
Updated: 2026-03-11T14:10:17.344Z
Status : Awaiting Analysis
Published: 2026-03-10T20:16:39.283
Modified: 2026-03-11T13:52:47.683
Link: CVE-2026-29792
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