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CVE-2026-106506

MEDIUM 5.3

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 improper input validation in scaffolder task list ordering. An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests. 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

0.2%chance of exploitation in 30 days · 12th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

5.3CVSS 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: Needs a race window or specific setup

✓ 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-202: : Exposure of Sensitive Information Through Data Queries
  • CWE-203: : Observable Discrepancy

CVSS vector

CVSS:3.1/AV:N/AC:H/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-vwp5-f99x-x3rq/GHSA-vwp5-f99x-x3rq.json"
  }
}
    GitHub Advisory Database · GHSA-vwp5-f99x-x3rq · Updated 2026-10-07T16:30:05.491300441Z

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 configure your reverse proxy or gateway to reject task-list requests with custom ordering, or strictly limit them to safe fields like created_at, status, and created_by. Enforce strict role-based access controls to restrict scaffolder task creation and read permissions exclusively to trusted users, preferably via owner-based conditions. Additionally, disable task recovery to reduce secret retention for claimed tasks and minimize the overall window of potential exposure.
    • none available: Fix deferred
    Red Hat · CVE-2026-106506 · Updated 2026-10-09T07:41:32+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 configure your reverse proxy or gateway to reject task-list requests with custom ordering, or strictly limit them to safe fields like created_at, status, and created_by. Enforce strict role-based access controls to restrict scaffolder task creation and read permissions exclusively to trusted users, preferably via owner-based conditions. Additionally, disable task recovery to reduce secret retention for claimed tasks and minimize the overall window of potential exposure.
    • none available: Fix deferred
    Red Hat · CVE-2026-106506 · Updated 2026-10-09T07:41:32+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 configure your reverse proxy or gateway to reject task-list requests with custom ordering, or strictly limit them to safe fields like created_at, status, and created_by. Enforce strict role-based access controls to restrict scaffolder task creation and read permissions exclusively to trusted users, preferably via owner-based conditions. Additionally, disable task recovery to reduce secret retention for claimed tasks and minimize the overall window of potential exposure.
    • none available: Fix deferred
    Red Hat · CVE-2026-106506 · Updated 2026-10-09T07:41:32+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 configure your reverse proxy or gateway to reject task-list requests with custom ordering, or strictly limit them to safe fields like created_at, status, and created_by. Enforce strict role-based access controls to restrict scaffolder task creation and read permissions exclusively to trusted users, preferably via owner-based conditions. Additionally, disable task recovery to reduce secret retention for claimed tasks and minimize the overall window of potential exposure.
    • none available: Fix deferred
    Red Hat · CVE-2026-106506 · Updated 2026-10-09T07:41:32+00:00

Known Affected Software Configurations

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

All CVSS metrics

  • MEDIUM 5.3 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
  • MEDIUM 5.3 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS