CVE-2026-29792 — Vulnerability in @feathersjs/authentication-oauth...

CRITICAL

Feathers has an OAuth Callback Account Takeover issue

Published March 10, 2026Updated March 13, 2026Source: osv

Summary

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)

Advisory Timeline

First published March 10, 2026 (216 days ago).
Last revised March 13, 2026 — 2 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update @feathersjs/authentication-oauth to 5.0.42 or later

npm install @feathersjs/authentication-oauth@5.0.42

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

Package	Ecosystem	Affected	Fixed In
@feathersjs/authentication-oauth	npm	All versions	5.0.42

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-287
Improper AuthenticationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

—

Confidentiality

—

Integrity

—

Availability

—

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

Frequently Asked Questions

What is CVE-2026-29792?: Feathers has an OAuth Callback Account Takeover issue This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-29792?: CVE-2026-29792 affects @feathersjs/authentication-oauth. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-29792 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-wg9x-qfgw-pxhj

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