CVE-2026-106495: Backstage: Improper access control in backend action invocation

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-12 · updated 2026-10-16
Weakness: CWE-284

Description

Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper access control in backend action invocation. An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced. This issue is fixed in version 0.17.8.

Affected products

@backstage backend-defaults: before 0.17.8
backstage: before 1.54.6

References

https://github.com/backstage/backstage/commit/a8fb34a990a69bcb745e85a3213cf9e5ba2d31a3
https://github.com/backstage/backstage/releases/tag/v1.54.6
https://github.com/backstage/backstage/security/advisories/GHSA-3xr5-8w6c-p5gw

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