CVE-2026-106457
MediumCVSS 6.8Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
In @backstage/plugin-auth-backend-module-cloudflare-access-provider from 0.1.0 to 0.5.0, insufficient audience validation in the Cloudflare Access auth provider allows a user with a valid token for another Access application to authenticate to Backstage. Fixed in version 0.5.0.
Risk Assessment
Risk of unauthorized authentication to Backstage by users holding tokens for other applications, potentially leading to access control breaches.
Recommendation
Upgrade @backstage/plugin-auth-backend-module-cloudflare-access-provider to version 0.5.0 or later to ensure audience validation.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS