CVE-2026-106457
CVE-2026-106457 · Backstage: Insufficient audience validation in the Cloudflare Access auth provider
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Backstage is an open framework for building developer portals. From 0.1.0 until 0.5.0, the @backstage/plugin-auth-backend-module-cloudflare-access-provider package is affected by insufficient audience validation in the cloudflare access auth provider. The Cloudflare Access auth provider verifies a token's signature and team issuer, but affected versions do not verify that the token was issued for the Backstage application. A user holding a valid token for another Access application in the same Cloudflare Zero Trust team may therefore be able to authenticate to Backstage if that token reaches the auth endpoint without the Backstage application's audience already being enforced upstream. Cloudflare Access normally evaluates the protected application before forwarding requests. This issue is fixed in version 0.5.0.
CVSS 6.8 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
backstage
- Versions
- >= 1.26.0, < 1.55.0: Affected
No fix published
plugin-auth-backend-module-cloudflare-access-provider
- Versions
- >= 0.1.0, < 0.5.0: Affected
No fix published
@backstage/plugin-auth-backend-module-cloudflare-access-provider npm
- Affected ranges
- SEMVER: ≥ 0.1.0, < 0.5.0
Update to 0.5.0