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Update dependency @backstage/plugin-proxy-backend to v0.6.18 [SECURITY] - #11784
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This PR contains the following updates:
0.6.4→0.6.18Warning
Some dependencies could not be looked up. Check the Dependency Dashboard for more information.
Backstage: Inconsistent credential enforcement for overlapping proxy routes
CVE-2026-106456 / GHSA-472h-9c5j-prrr
More information
Details
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 therefore reach the nested upstream through Backstage, including with static upstream credentials configured for that proxy.
Exploitation requires this specific overlapping route configuration. The resulting confidentiality and integrity impact depends on the capabilities exposed by the nested upstream.
Patches
Upgrade
@backstage/plugin-proxy-backendto version0.6.18or later. The fixed package is available in Backstage v1.55.0.Workarounds
dangerously-allow-unauthenticated.Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Backstage: Improper input validation in proxy-backend
CVE-2026-106491 / GHSA-9ghw-48h5-v2w5
More information
Details
Impact
An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server. This is limited to target servers already configured as proxy endpoints and requires Backstage authentication by default.
Patches
Patched in
@backstage/plugin-proxy-backendversion0.6.17Workarounds
Severity
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
backstage/backstage (@backstage/plugin-proxy-backend)
v0.6.18Compare Source
Patch Changes
736d84e: Use locale-insensitive Unicode casing for consistent string handling across environments.42580a2: Improved request path handling in the proxy-backend.9df9292: Ensure HTTP proxy requests consistently apply their configured credential requirements.v0.6.17Compare Source
v0.6.16Compare Source
Patch Changes
v0.6.15Compare Source
Patch Changes
v0.6.14Compare Source
Patch Changes
v0.6.13Compare Source
Patch Changes
v0.6.12Compare Source
Patch Changes
v0.6.11Compare Source
Patch Changes
v0.6.10Compare Source
Patch Changes
7455dae: Use node prefix on native importsv0.6.9Compare Source
Patch Changes
de96a60: chore(deps): bumpexpressfrom 4.21.2 to 4.22.0v0.6.8Compare Source
Patch Changes
v0.6.7Compare Source
Patch Changes
v0.6.6Compare Source
Patch Changes
v0.6.5Compare Source
Patch Changes
0810cd8: correct rewrite rule to avoid extra subpath in proxy pathConfiguration
📅 Schedule: (UTC)
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♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.
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This PR has been generated by Mend Renovate CLI.