Incorrect Authorization Affecting @backstage/backend-defaults package, versions <0.16.1>=0.17.0 <0.17.8
Threat Intelligence
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- published11 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-106492 (opens in a new tab)How to fix?
Upgrade @backstage/backend-defaults to version 0.16.1, 0.17.8 or higher.
Overview
@backstage/backend-defaults is a Backend defaults used by Backstage backend apps
Affected versions of this package are vulnerable to Incorrect Authorization via the service credential delegation path in DefaultAuthService, when a token issued to an external service principal carries access restrictions (such as read-only). During plugin-to-plugin token delegation, the getPluginRequestToken flow previously did not propagate or enforce the per-plugin access restriction map (allAccessRestrictions), allowing the restricted credential to obtain a delegated plugin token with full access to any target plugin, bypassing the configured restrictions.
Note: This is only exploitable when an external service credential is configured with access restrictions.