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CVE-2026-106488

HIGH 8.1

Published 2026-10-06 · Last modified 2026-10-07

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.

ELEVATED IMPACT

Severe if exploited (CVSS 8.1), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 20th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

8.1CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Backstage @Backstage Linuxfoundation

Products Backstage Plugin Auth Backend Module Oidc Provider Backstage\/Plugin Auth Backend Module Oidc Provider

Weakness (CWE)

  • CWE-287: : Improper Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • @backstage/plugin-auth-backend-module-oidc-provider npm

    pkg:npm/%40backstage/plugin-auth-backend-module-oidc-provider

    SEMVER range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 0.4.20
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-826h-28h9-65hg/GHSA-826h-28h9-65hg.json"
  }
}
    GitHub Advisory Database · GHSA-826h-28h9-65hg · Updated 2026-10-07T18:15:10.726184367Z

Vendor product assessments

  • rhdh/rhdh-hub-rhel9 as a component of Red Hat Developer Hub · known affected

    Vendor assessment for this product only.

    pkg:oci/rhdh-hub-rhel9?repository_url=registry.redhat.io/rhdh/rhdh-hub-rhel9

    • workaround: To mitigate this vulnerability without code modifications, apply either of the following operational or configuration controls: 1. Configure the external OpenID Connect (OIDC) identity provider to require verified email addresses before permitting user authentication. 2. Reconfigure the portal sign-in resolver to map users using immutable identifiers (such as the provider subject 'sub' claim) rather than email-based claims. Caveats: Enforcing email verification in the identity provider prevents users with unconfirmed addresses from logging in until verification is completed. Modifying sign-in resolver configurations in Red Hat Developer Hub requires restarting the service or container pod, which causes a temporary interruption in service availability.
    • none available: Affected
    Red Hat · CVE-2026-106488 · Updated 2026-10-09T09:22:38+00:00
  • ansible-automation-platform/bootc-automation-portal-rhel9 as a component of Self-service automation portal 2 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-automation-portal-rhel9?repository_url=registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9

    • workaround: To mitigate this vulnerability without code modifications, apply either of the following operational or configuration controls: 1. Configure the external OpenID Connect (OIDC) identity provider to require verified email addresses before permitting user authentication. 2. Reconfigure the portal sign-in resolver to map users using immutable identifiers (such as the provider subject 'sub' claim) rather than email-based claims. Caveats: Enforcing email verification in the identity provider prevents users with unconfirmed addresses from logging in until verification is completed. Modifying sign-in resolver configurations in Red Hat Developer Hub requires restarting the service or container pod, which causes a temporary interruption in service availability.
    • none available: Affected
    Red Hat · CVE-2026-106488 · Updated 2026-10-09T09:22:38+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxfoundationBackstage\/Plugin Auth Backend Module Oidc Provider< 0.4.20
LinuxfoundationBackstage< 1.54.6

All CVSS metrics

  • HIGH 8.1 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
  • HIGH 8.1 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS