What’s Vulnerable › Vulnerabilities

CVE-2026-106462: Backstage: Scaffolder credential handling may allow unintended GitHub authentication fallback

• Severity: medium (CVSS 6.4 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: 2026-10-06 · updated 2026-10-22
• Weakness: CWE-441

Description

Backstage is an open framework for building developer portals. Prior to 1.54.6, scaffolder source-control actions may not consistently enforce intended credential boundaries. An authenticated user could cause an affected action to fall back to broader integration credentials and perform operations with more access than intended. This issue is fixed in 1.54.6 when operators also enable scaffolder.requireScmUserCredentials after upgrading.

Affected products

• backstage: before 1.54.6 — fixed in 1.54.6
• @backstage plugin-scaffolder-backend: before 0.11.10 — fixed in 0.11.10
• Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Azure: before 0.2.25 — fixed in 0.2.25
• Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Bitbucket-Cloud: before 0.3.10 — fixed in 0.3.10
• Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Bitbucket-Server: before 0.2.25 — fixed in 0.2.25
• Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Github: before 0.9.13 — fixed in 0.9.13
• Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Gitlab: before 0.11.10 — fixed in 0.11.10

How to fix

Upgrade to a fixed version: backstage 1.54.6; @backstage plugin-scaffolder-backend 0.11.10; Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Azure 0.2.25; Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Bitbucket-Cloud 0.3.10; Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Bitbucket-Server 0.2.25; Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Github 0.9.13; Linuxfoundation Backstage/Plugin-Scaffolder-Backend-Module-Gitlab 0.11.10. Check the vendor advisory for mitigations.

References

• https://github.com/backstage/backstage/commit/6fb2a41ea47da37eafe5ea744050ef90be6820c0
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-29gx-h2m3-xw44

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