Vulnpedia
← Search CVEs

CVE-2026-106504

MEDIUM 6.5

Published 2026-10-06 · Last modified 2026-10-07

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value. This issue is fixed in version 4.1.0.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 17th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

6.5CVSS 3.1 · MEDIUM

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Backstage @Backstage Linuxfoundation

Products Backstage Plugin Scaffolder Backend Backstage\/Plugin Scaffolder Backend

Weakness (CWE)

  • CWE-532: : Insertion of Sensitive Information into Log File

CVSS vector

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

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • @backstage/plugin-scaffolder-backend npm

    pkg:npm/%40backstage/plugin-scaffolder-backend

    SEMVER range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 4.1.0
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4xvq-3m68-h444/GHSA-4xvq-3m68-h444.json"
  }
}
    GitHub Advisory Database · GHSA-4xvq-3m68-h444 · Updated 2026-10-07T16:30:05.290352985Z

Vendor product assessments

  • rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend as a component of Red Hat Developer Hub · known affected

    Vendor assessment for this product only.

    pkg:oci/red-hat-developer-hub-backstage-plugin-orchestrator-backend?repository_url=registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend

    • workaround: To mitigate this issue, implement operational and access control restrictions: 1. Restrict scaffolder task creation and task log viewing permissions exclusively to trusted users through the application permission policy framework. 2. Review scaffolder templates to avoid passing sensitive credentials or secrets into inputs of actions that are subject to permission denials. Caveats: Restricting task creation and log inspection permissions limits self-service scaffolding capabilities for standard portal users.
    • none available: Fix deferred
    Red Hat · CVE-2026-106504 · Updated 2026-10-08T23:53:31+00:00
  • rhdh/rhdh-hub-rhel9 as a component of Red Hat Developer Hub · known affected

    Vendor assessment for this product only.

    pkg:oci/rhdh-hub-rhel9?repository_url=registry.redhat.io/rhdh/rhdh-hub-rhel9

    • workaround: To mitigate this issue, implement operational and access control restrictions: 1. Restrict scaffolder task creation and task log viewing permissions exclusively to trusted users through the application permission policy framework. 2. Review scaffolder templates to avoid passing sensitive credentials or secrets into inputs of actions that are subject to permission denials. Caveats: Restricting task creation and log inspection permissions limits self-service scaffolding capabilities for standard portal users.
    • none available: Fix deferred
    Red Hat · CVE-2026-106504 · Updated 2026-10-08T23:53:31+00:00
  • ansible-automation-platform/automation-portal as a component of Self-service automation portal 2 · known affected

    Vendor assessment for this product only.

    pkg:oci/automation-portal?repository_url=registry.redhat.io/ansible-automation-platform/automation-portal

    • workaround: To mitigate this issue, implement operational and access control restrictions: 1. Restrict scaffolder task creation and task log viewing permissions exclusively to trusted users through the application permission policy framework. 2. Review scaffolder templates to avoid passing sensitive credentials or secrets into inputs of actions that are subject to permission denials. Caveats: Restricting task creation and log inspection permissions limits self-service scaffolding capabilities for standard portal users.
    • none available: Fix deferred
    Red Hat · CVE-2026-106504 · Updated 2026-10-08T23:53:31+00:00
  • ansible-automation-platform/bootc-automation-portal-rhel9 as a component of Self-service automation portal 2 · known affected

    Vendor assessment for this product only.

    pkg:oci/bootc-automation-portal-rhel9?repository_url=registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9

    • workaround: To mitigate this issue, implement operational and access control restrictions: 1. Restrict scaffolder task creation and task log viewing permissions exclusively to trusted users through the application permission policy framework. 2. Review scaffolder templates to avoid passing sensitive credentials or secrets into inputs of actions that are subject to permission denials. Caveats: Restricting task creation and log inspection permissions limits self-service scaffolding capabilities for standard portal users.
    • none available: Fix deferred
    Red Hat · CVE-2026-106504 · Updated 2026-10-08T23:53:31+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxfoundationBackstage\/Plugin Scaffolder Backend< 4.1.0
LinuxfoundationBackstage< 1.54.6

All CVSS metrics

  • MEDIUM 6.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
  • MEDIUM 6.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS