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CVE-2026-106457

8.1, high

backstage Improper Authentication Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.1, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 20% of scored CVEs
Exploitation
No public evidence
Published
6 Oct 202622 days ago

Description

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.

Details

Vendor
Backstage and 1 more
Product
backstage
Weakness
CWE-287 (opens in a new tab)
Status
Analyzed
Updated
27 Oct 2026
Assigner
security-advisories@github.com

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References 3

Patches and fixes 2

Advisories 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Backstage CVEs

Every Backstage CVE we hold

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Beyond this page

Is CVE-2026-106457 in your network?

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 28 Oct 2026, not the live upstream state.