# CVE-2026-29792: Feathers OAuth callback account takeover

Source: https://junglewise.ai/threats/cve-2026-29792-feathers-oauth-callback-account-takeover  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-10. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-29792 · Severity: medium · CVSS 4 · Published 2026-03-10

Feathers is a JavaScript backend framework that includes OAuth authentication support. An unauthenticated attacker can forge a malicious request to bypass the OAuth authentication flow and obtain a valid access token for any existing user account, leading to complete account takeover without needing valid OAuth credentials.

Technologies: [Feathers Authentication-Oauth](https://junglewise.ai/threats/technologies/authentication-oauth), [@feathersjs/authentication-oauth (npm)](https://junglewise.ai/threats/technologies/feathersjs-authentication-oauth). Vendors: [Feathers](https://junglewise.ai/threats/vendors/feathers), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-29792 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-29792 being exploited in the wild.

**How severe is CVE-2026-29792?** Medium severity, with a CVSS score of 4, published 10 March 2026.

**Which products and versions are affected?** Feathers Authentication-Oauth 5.0.0 through 5.0.41; @feathersjs/authentication-oauth (npm) SEMVER:introduced=5.0.0,fixed=5.0.42.

**Is there a fix for CVE-2026-29792?** Yes. @feathersjs/authentication-oauth (npm): upgrade to 5.0.42 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-29792 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-29792?** Check whether you run Feathers Authentication-Oauth or @feathersjs/authentication-oauth (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @feathersjs/authentication-oauth (npm): upgrade to 5.0.42 or later

  ```sh
  npm install @feathersjs/authentication-oauth@5.0.42
  ```


## Technical details

The vulnerability exists in the OAuth callback handler (/oauth/:provider/callback) which contains a fallback chain that reaches the raw request query parameters when the OAuth provider's session/state validation is empty. Since an attacker never initiates a legitimate OAuth authorize flow, the Grant library has no session to validate and produces no response, causing the fallback to fire. The attacker can then inject a forged profile via query parameters, which is used for entity lookup and JWT token generation, resulting in a valid access token for an arbitrary user. This is an unauthenticated, network-accessible bypass of the authentication mechanism. The vulnerability affects @feathersjs/authentication-oauth versions 5.0.0 through 5.0.41 and is fixed in version 5.0.42.

## Affected products

- Feathers authentication-oauth 5.0.0 through 5.0.41

## Identifiers

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

## Timeline

- 2026-03-10: disclosed
- 2026-03-10: patched: Fixed in version 5.0.42

## References

- [https://github.com/feathersjs/feathers/security/advisories/GHSA-wg9x-qfgw-pxhj](https://github.com/feathersjs/feathers/security/advisories/GHSA-wg9x-qfgw-pxhj)

## Related threats

- [Feathers authentication-oauth information disclosure via unencrypted session cookie](https://junglewise.ai/threats/cve-2026-27193-feathers-authentication-oauth-information-disclosure-via)
- [Feathers authentication-oauth origin validation bypass via prefix matching](https://junglewise.ai/threats/cve-2026-27192-feathers-authentication-oauth-origin-validation-bypass-via-prefix)
- [Feathers open redirect in OAuth callback enables account takeover](https://junglewise.ai/threats/cve-2026-27191-feathers-open-redirect-in-oauth-callback-enables-account-takeover)