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Advisory record · GHSA-826h-28h9-65hg

Backstage: Improper authentication in the OIDC provider

CVSS 8.1 HighEPSS 0.0028 · 20th percentile

Published by the GitHub Advisory Database at 7 Oct 2026, 18:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
@backstage/plugin-auth-backend-module-oidc-providernpm<0.4.200.4.20
Identifiers
GHSA-826h-28h9-65hg · CVE-2026-106488
Weakness (CWE)
CWE-287
Tags
Published
7 Oct 2026
Updated
7 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The @backstage/plugin-auth-backend-module-oidc-provider npm package is affected in versions before 0.4.20. Deployments that use email-based identity resolution with an OIDC provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity, gaining that user's access and permissions. Upgrade to version 0.4.20; until then, disable email-based sign-in resolution or require the identity provider to verify email addresses.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.1 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0028, the 20th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.