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TI-2026-69063 Aliases CVE-2026-106488GHSA-826h-28h9-65hg

Backstage: Improper authentication in the OIDC provider

Priority LOW 37CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-287.

Summary

Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package has improper authentication (CWE-287) in its OIDC provider. Deployments that use OIDC email-based identity resolution with a provider that permits unverified email addresses let an authenticated provider user assume another catalog identity, along with that identity's access and permissions. No direct availability impact has been demonstrated, and the CVSS 3.1 base score is 8.1 (HIGH).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0028 20th percentileScored 2026-11-07
Fix Partial backstage (backstage): 1.54.6plugin-auth-backend-module-oidc-provider (@backstage): 0.4.20+1 more productRed Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagebackstagebefore 1.54.61.54.6Patch availableCNA
backstageplugin-auth-backend-module-oidc-providerbefore 0.4.200.4.20Patch availableCNA
—@backstage/plugin-auth-backend-module-oidc-provider (npm)before 0.4.200.4.20Patch availableGHSA-826h-28h9-65hg
  • backstage Vendorbackstage Affected before 1.54.6 Fixed in 1.54.6 Patch available CNA
  • plugin-auth-backend-module-oidc-provider Vendorbackstage Affected before 0.4.20 Fixed in 0.4.20 Patch available CNA
  • @backstage/plugin-auth-backend-module-oidc-provider (npm) Vendor— Affected before 0.4.20 Fixed in 0.4.20 Patch available GHSA-826h-28h9-65hg

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:backstage\/plugin-auth-backend-module-oidc-provider:*:*:*:*:*:node.js:*:*before 0.4.20Vulnerablebackstage
cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*before 1.54.6Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:backstage\/plugin-auth-backend-module-oidc-provider:*:*:*:*:*:node.js:*:* Versions before 0.4.20 Vulnerable ·backstage
  • cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* Versions before 1.54.6 Vulnerable ·backstage

Remediation

Update the @backstage/plugin-auth-backend-module-oidc-provider package to 0.4.20, the fixed version. The sources list no fixed version for Red Hat Developer Hub 1 and Self-service automation portal 2.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA backstage (backstage) Fixed in 1.54.6
  • Fix · CNA plugin-auth-backend-module-oidc-provider (@backstage) Fixed in 0.4.20
  • Fix · GHSA-826h-28h9-65hg @backstage/plugin-auth-backend-module-oidc-provider (npm) Fixed in 0.4.20 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Developer Hub 1AffectedNo fix yet
Self-service automation portal 2AffectedNo fix yet

Timeline

  1. 2026-10-07 Threatist record created from CVE-2026-106488
  2. 2026-10-07 CISA SSVC decision points changed
  3. 2026-10-07 Priority changed: MEDIUM → LOW
  4. 2026-10-07 Alias added: GHSA-826h-28h9-65hg
  5. 2026-10-07 Fix available: npm/@backstage/[email protected] · GHSA-826h-28h9-65hg
  6. 2026-10-07 CVSS score added · GHSA-826h-28h9-65hg
  7. 2026-10-07 Weakness changed · GHSA-826h-28h9-65hg
  8. 2026-10-07 5 new references · GHSA-826h-28h9-65hg
  9. 2026-10-09 Affected versions changed · Red Hat
  10. 2026-10-09 CVSS score added · Red Hat
  11. 2026-10-27 Affected versions changed · Red Hat

References

Patch 2

Advisory 2

Other 1

  • TI-2023-17988 Insecure sandbox in Backstage Scaffolder plugin CVSS 3.1CRITICAL 9.9
  • TI-2026-69075 Sensitive information exposure in Backstage Scaffolder CVSS 3.1CRITICAL 9.6
  • TI-2026-69061 Path traversal in Backstage Bitbucket pull-request scaffolder actions CVSS 3.1CRITICAL 9.9
  • TI-2026-60083 Backstage: Improper input validation in TechDocs MkDocs configuration CVSS 3.1HIGH 8.8
  • TI-2026-69165 Backstage TechDocs config flaw allows code execution CVSS 3.1HIGH 8.8
  • TI-2026-69083 Code injection via MkDocs theme configuration in Backstage TechDocs CVSS 3.1HIGH 8.8
See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences