CVE-2026-106491

A flaw was found in the Backstage plugin-proxy-backend component. An authenticated remote attacker can exploit improper input validation by submitting a specially crafted request URL to the proxy backend. This causes the proxy service to forward requests to endpoints outside the configured base...

Backstage: Inconsistent credential enforcement for overlapping proxy routes

Impact An operator can configure overlapping proxy paths with different credential requirements. When a parent path permits unauthenticated access and a nested path requires credentials, the parent exemption can also cover requests handled by the nested proxy. An unauthenticated caller may...

GHSA-472H-9C5J-PRRR Backstage: Inconsistent credential enforcement for overlapping proxy routes

Impact An operator can configure overlapping proxy paths with different credential requirements. When a parent path permits unauthenticated access and a nested path requires credentials, the parent exemption can also cover requests handled by the nested proxy. An unauthenticated caller may...

EUVD-2026-93989

Backstage: Inconsistent credential enforcement for overlapping proxy routes...

Incorrect Authorization

Overview @backstage/plugin-proxy-backend is an A Backstage backend plugin that helps you set up proxy endpoints in the backend Affected versions of this package are vulnerable to Incorrect Authorization via inconsistent application of route credentials in the proxy router...

EUVD-2026-94010

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

Directory Traversal

Overview @backstage/plugin-proxy-backend is an A Backstage backend plugin that helps you set up proxy endpoints in the backend Affected versions of this package are vulnerable to Directory Traversal via the proxy request path handling in router.ts when an attacker sends a request containing .. pa...

CVE-2026-106456

A flaw was found in the Backstage plugin-proxy-backend package. When overlapping proxy paths are configured with different authentication requirements, access exemptions permitted on a parent route can improperly extend to nested routes that require credentials. A remote, unauthenticated attacker...

CVE-2026-106491

Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to ...

CVE-2026-106456

Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential...

CVE-2026-106491

The Backstage framework, an open framework for building developer portals, is vulnerable to improper input validation within the @backstage/plugin-proxy-backend package in versions prior to 0.6.17 . An authenticated user can craft a request URL that forces the proxy-backend to forward requests to...

CVE-2026-106491 Backstage: Improper input validation in proxy-backend

Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to ...

CVE-2026-106491 Backstage: Improper input validation in proxy-backend

Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to ...

CVE-2026-106491 Backstage: Improper input validation in proxy-backend

Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to ...

CVE-2026-106491

Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to ...

CVE-2026-106456 Backstage: Inconsistent credential enforcement for overlapping proxy routes

Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential...

CVE-2026-106456 Backstage: Inconsistent credential enforcement for overlapping proxy routes

Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential...

CVE-2026-106456 Backstage: Inconsistent credential enforcement for overlapping proxy routes

Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential...

CVE-2026-106456

The Backstage open framework for developer portals is affected by a vulnerability in the @backstage/plugin-proxy-backend package (versions 0.5.0 through 0.6.18 ). The root cause is inconsistent credential enforcement for overlapping proxy routes; if a parent path allows unauthenticated access whi...

CVE-2026-106456

Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential...