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    CVE-2026-106488

    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.

    Published:Oct 6, 2026
    Last Modified:Oct 22, 2026
    EPS:Oct 6, 2026
    EPSS Score:0.0028
    CVSS Score:8.1

    Affected Products

    Vendor
    Backstage
    Product
    Backstage
    Vendor
    Backstage
    Product
    Plugin-auth-backend-module-oidc-provider
    Vendor
    Linuxfoundation
    Product
    Backstage
    Vendor
    Linuxfoundation
    Product
    Backstage\/plugin-auth-backend-module-oidc-provider

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-151 Identity Spoofing
    CAPEC-194 Fake the Source of Data
    CAPEC-21 Exploitation of Trusted Identifiers
    CAPEC-22 Exploiting Trust in Client
    CAPEC-459 Creating a Rogue Certification Authority Certificate
    CAPEC-461 Web Services API Signature Forgery Leveraging Hash Function Extension Weakness
    CAPEC-473 Signature Spoof
    CAPEC-476 Signature Spoofing by Misrepresentation
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-59 Session Credential Falsification through Prediction
    CAPEC-593 Session Hijacking
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-633 Token Impersonation
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-667 Bluetooth Impersonation AttackS (BIAS)
    CAPEC-94 Adversary in the Middle (AiTM)

    Related CVEs

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    CVE-2026-106557 (CVSS 7.7) — Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plug…
    CVE-2026-106563 (CVSS 5.3) — Backstage is an open framework for building developer portals. Prior to 0.21.8, the @backstage/plugin-kubernet…
    CVE-2026-106562 (CVSS 4.3) — Backstage is an open framework for building developer portals. Prior to 2.1.6 in @backstage/plugin-search-back…
    CVE-2026-106561 (CVSS 5) — Backstage is an open framework for building developer portals. Prior to 0.21.9, the @backstage/plugin-kubernet…
    CVE-2026-106560 (CVSS 7.1) — Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffold…
    CVE-2026-106559 (CVSS 6.3) — Backstage is an open framework for building developer portals. Prior to 0.3.25, the @backstage/plugin-scaffold…
    CVE-2026-106558 (CVSS 8.8) — Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backst…
    CVE-2026-106556 (CVSS 7.7) — Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High