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.
References
| Link | Resource |
|---|---|
| https://github.com/backstage/backstage/commit/ed9034cacd9def3b3674f0a764fe992f751e204d | Patch |
| https://github.com/backstage/backstage/releases/tag/v1.55.0 | Patch Release Notes |
| https://github.com/backstage/backstage/security/advisories/GHSA-q333-f498-w2x7 | Mitigation Vendor Advisory |
Configurations
History
27 Oct 2026, 20:48
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linuxfoundation
Linuxfoundation backstage Linuxfoundation backstage\/plugin-auth-backend-module-cloudflare-access-provider |
|
| CPE | cpe:2.3:a:linuxfoundation:backstage\/plugin-auth-backend-module-cloudflare-access-provider:*:*:*:*:*:node.js:*:* cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* |
|
| References | () https://github.com/backstage/backstage/commit/ed9034cacd9def3b3674f0a764fe992f751e204d - Patch | |
| References | () https://github.com/backstage/backstage/releases/tag/v1.55.0 - Patch, Release Notes | |
| References | () https://github.com/backstage/backstage/security/advisories/GHSA-q333-f498-w2x7 - Mitigation, Vendor Advisory |
06 Oct 2026, 21:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-06 21:17
Updated : 2026-10-27 20:48
NVD link : CVE-2026-106457
Mitre link : CVE-2026-106457
CVE.ORG link : CVE-2026-106457
JSON object : View
Products Affected
linuxfoundation
- backstage\/plugin-auth-backend-module-cloudflare-access-provider
- backstage
CWE
CWE-287
Improper Authentication
