What’s Vulnerable › Vulnerabilities
CVE-2026-29792: Feathersjs has an OAuth Callback Account Takeover
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-10 · updated 2026-06-17
- Weakness: CWE-287
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.
Affected products
- feathersjs feathers: from 5.0.0 before 5.0.42 — fixed in 5.0.42
How to fix
Upgrade to a fixed version: feathersjs feathers 5.0.42. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-29792 or the next vulnerability affects your stack