EUVD-2026-94003

Backstage has iImproper filesystem validation in Bitbucket pull-request scaffolder actions...

@backstage/plugin-scaffolder-backend (>=0.0.0-nightly-20240207020916, <=3.1.3-next.2), @backstage/plugin-scaffolder-backend-module-bitbucket (>=0.0.0-nightly-20240207020916, <=0.3.20-next.0) potentially affected by CVE-2026-106486 via @backstage/plugin-scaffolder-backend-module-bitbucket-server (>=0.0.0-nightly-20240929023448, <=0.2.19-next.0)

@backstage/plugin-scaffolder-backend-module-bitbucket-server NPM version =0.0.0-nightly-20240929023448, =0.0.0-nightly-20240207020916, =0.0.0-nightly-20240207020916, =0.3.20-next.0 Source cves: CVE-2026-106486 Source advisory: GHSA-G8RX-F7M5-7794...

@alithya-oss/backstage-plugin-scaffolder-backend-module-aws-apps (>=0.3.10, <=0.3.12), @alithya-oss/plugin-scaffolder-backend-module-aws-apps (>=0.3.6, <=0.3.9) +55 more potentially affected by CVE-2026-106486 via @backstage/plugin-scaffolder-backend-module-bitbucket-cloud (>=0.0.0-nightly-20240929023448, <=0.3.4-next.0)

@backstage/plugin-scaffolder-backend-module-bitbucket-cloud NPM version =0.0.0-nightly-20240929023448, =0.3.10, =0.3.6, =0.1.0, =0.4.0, =0.0.0-nightly-20240207020916, =0.0.0-nightly-20240207020916, =0.2.5, =0.3.5, =0.1.0, =0.2.3, =0.4.3, =0.1.10, =0.1.14 -...

EUVD-2026-94005

Backstage: Unsupported catalog cluster authentication mode in kubernetes backend...

@backstage/plugin-kubernetes (>=0.0.0-nightly-202010102951, <=0.4.2), @devangelista/backstage-scaffolder-kubernetes (>=0.4.0, <=0.5.0) +3 more potentially affected by CVE-2026-106487 via @backstage/plugin-kubernetes-backend (>=0.0.0-nightly-20260928023907, <=0.20.4)

@backstage/plugin-kubernetes-backend NPM version =0.0.0-nightly-20260928023907, =0.0.0-nightly-202010102951, =0.4.0, =1.0.0, =1.1.0, =1.15.1, =2.9.1 Source cves: CVE-2026-106487 Source advisory: GHSA-H53X-HJX6-25GR...

@backstage/plugin-kubernetes (>=0.0.0-nightly-202010102951, <=0.4.2), @devangelista/backstage-scaffolder-kubernetes (>=0.4.0, <=0.5.0) +3 more potentially affected by CVE-2026-106487 via @backstage/plugin-kubernetes-backend (>=0.0.0-nightly-20260928023907, <=0.20.4)

@backstage/plugin-kubernetes-backend NPM version =0.0.0-nightly-20260928023907, =0.0.0-nightly-202010102951, =0.4.0, =1.0.0, =1.1.0, =1.15.1, =2.9.1 Source cves: CVE-2026-106487 Source advisory: OSV:GHSA-H53X-HJX6-25GR...

Backstage: Unsupported catalog cluster authentication mode in kubernetes backend

Impact Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources...

GHSA-H53X-HJX6-25GR Backstage: Unsupported catalog cluster authentication mode in kubernetes backend

Impact Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources...

GHSA-826H-28H9-65HG Backstage: Improper authentication in the OIDC provider

Impact 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...

EUVD-2026-94007

Backstage: Improper authentication in the OIDC provider...

@backstage/plugin-auth-backend (>=0.0.0-nightly-20240122021809, <=0.24.4-next.2), @backstage/plugin-auth-backend-module-aws-alb-provider (>=0.0.0-nightly-20240929023448, <=0.4.1-next.2) +1 more potentially affected by CVE-2026-106488 via @backstage/plugin-auth-backend-module-oidc-provider (>=0.0.0-nightly-20240929023448, <=0.4.1-next.2)

@backstage/plugin-auth-backend-module-oidc-provider NPM version =0.0.0-nightly-20240929023448, =0.0.0-nightly-20240122021809, =0.0.0-nightly-20240929023448, =0.2.4-next.2, =0.2.5 Source cves: CVE-2026-106488 Source advisory: OSV:GHSA-826H-28H9-65HG...

@backstage/plugin-auth-backend (>=0.0.0-nightly-20240122021809, <=0.24.4-next.2), @backstage/plugin-auth-backend-module-aws-alb-provider (>=0.0.0-nightly-20240929023448, <=0.4.1-next.2) +1 more potentially affected by CVE-2026-106488 via @backstage/plugin-auth-backend-module-oidc-provider (>=0.0.0-nightly-20240929023448, <=0.4.1-next.2)

@backstage/plugin-auth-backend-module-oidc-provider NPM version =0.0.0-nightly-20240929023448, =0.0.0-nightly-20240122021809, =0.0.0-nightly-20240929023448, =0.2.4-next.2, =0.2.5 Source cves: CVE-2026-106488 Source advisory: GHSA-826H-28H9-65HG...

EUVD-2026-94008

Backstage: Improper authorization enforcement for TechDocs static content...

GHSA-RG9R-HR7G-5GC2 Backstage: Improper authorization enforcement for TechDocs static content

Impact An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider S3, GCS, etc. and the permission framework...

EUVD-2026-94009

Backstage: Improper input validation in TechDocs static content requests...

GHSA-7MFX-XG57-53C9 Backstage: Improper input validation in TechDocs static content requests

Impact When using the Azure Blob Storage provider, an authenticated Backstage user may be able to read restricted TechDocs content when entity-level permissions are enabled. Deployments that intentionally disable the default backend authentication policy may have broader exposure. Patches Patched...

EUVD-2026-94010

Backstage: Improper input validation in proxy-backend...

Backstage: Improper preservation of access restrictions during service credential delegation

Impact An external service credential configured with access restrictions e.g., read-only could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugi...

EUVD-2026-94052

Backstage: Inconsistent enforcement of allowed location types during catalog processing...

Backstage: Inconsistent enforcement of allowed location types during catalog processing

Impact Under certain configurations, the catalog backend could process location types that were not intended to be allowed, potentially leading to unintended file access on the backend host. Patches Patched in @backstage/plugin-catalog-backend version 3.9.1 Workarounds No practical workarounds ar...