Dashboard / CVE-2026-106457

CVE-2026-106457

HIGH
MEDIUM Priority: 0.02 BB Relevance: 66/100
Published: 2026-10-06 Modified: 2026-10-27 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
S: Unchanged
C: High
I: High
A: None

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
linuxfoundation backstage 1.26.0 – 1.55.0
linuxfoundation backstage\/plugin-auth-backend-module-cloudflare-access-provider 0.1.0 – 0.5.0

References & Advisories (3)

Bug Bounty Relevance

66 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

8.1 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploitation Probability

0.28%
Raw Score 0.002810
Percentile 20.6%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00281
2026-10-28
0.00281

Intelligence Sources

nvd ref →

External Links