---
title: "CVE-2026-29792: Feathers has an OAuth Callback Account Takeover issue"
url: https://erroneo.us/security/cve/CVE-2026-29792/
description: "CVE-2026-29792 (@feathersjs/authentication-oauth (npm)): Feathersjs is a framework for creating web APIs and real-time applications with TypeScript or…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-10
date_modified: 2026-03-11
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-29792"
kev: false
cvss: 9.3
epss: 0.00653
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-29792: Feathers has an OAuth Callback Account Takeover issue

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @feathersjs/authentication-oauth (npm) >= 5.0.0, <= 5.0.41, fixed in 5.0.42 . Check your lockfile, including transitive dependencies.

## What it is

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 packages

- npm `@feathersjs/authentication-oauth` >= 5.0.0, <= 5.0.41 → fixed: 5.0.42

## Affected products (CVE record)

- feathersjs feathers: >= 5.0.0, < 5.0.42
- @feathersjs authentication-oauth: >= 5.0.0, < 5.0.42

## Severity

- GitHub_M CVSS 4.0: 9.3 `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`
- GitHub CVSS 4.0: 9.3 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.65% probability of exploitation activity in the next 30 days; percentile 51.

## Sources

- [GitHub Advisory GHSA-wg9x-qfgw-pxhj](https://github.com/advisories/GHSA-wg9x-qfgw-pxhj)
- [CVE.org record CVE-2026-29792](https://www.cve.org/CVERecord?id=CVE-2026-29792)
- [NVD entry CVE-2026-29792](https://nvd.nist.gov/vuln/detail/CVE-2026-29792)
- [github.com](https://github.com/feathersjs/feathers/security/advisories/GHSA-wg9x-qfgw-pxhj)

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Source page: https://erroneo.us/security/cve/CVE-2026-29792/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt