CVE-2026-106492

HIGH 7.6

Backstage: Improper preservation of access restrictions during service credential delegation

CVSS Score

7.6

EPSS Score

0.0%

EPSS Percentile

0th

Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.

CWE	CWE-269 CWE-863
Vendor	backstage
Product	backstage
Published	Oct 6, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

Low

Affected Versions

backstage / backstage

< 1.49.6 >= 1.50.0-next.0, < 1.54.6

@backstage / backend-defaults

< 0.16.1 >= 0.17.0, < 0.17.8

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v github.com: https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124 github.com: https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33 github.com: https://github.com/backstage/backstage/releases/tag/v1.49.6 github.com: https://github.com/backstage/backstage/releases/tag/v1.54.6