---
id: CVE-2026-106488
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. Prior to
  0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is
  affected by improper authentication in the oidc provider. Deployments using
  OIDC email-bas…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-287
vendor: backstage
product: backstage
affected:
  - backstage < 1.54.6
  - plugin-auth-backend-module-oidc-provider < 0.4.20
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T21:17:17.623'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106488'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/1b1f05e82161aaabc226c1d7d498d746956bf942
    label: security-advisories@github.com
  - url: 'https://github.com/backstage/backstage/releases/tag/v1.54.6'
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hg
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T21:20:28.984Z'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is affected by improper authentication in the oidc provider. Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. This issue is fixed in version 0.4.20.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.