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CVE-2026-106500

HIGH 8.5

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

Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

ELEVATED IMPACT

Severe if exploited (CVSS 8.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 27th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

8.5CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

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-59: : Improper Link Resolution Before File Access ('Link Following')
  • CWE-362: : Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

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

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-xvgh-hmx8-9xxf/GHSA-xvgh-hmx8-9xxf.json"
  }
}
    GitHub Advisory Database · GHSA-xvgh-hmx8-9xxf · Updated 2026-10-07T18:15:10.728658409Z

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@sha256:96846b52574b28705e69ffcf4989780852535526a7859adc28f9842d83f50a92?repository_url=registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend

    • workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    • none available: Affected
    Red Hat · CVE-2026-106500 · Updated 2026-10-20T00:14:31+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@sha256:6d6fb29bd26ff5f8ee2df1302cc228c1358a9dfde83f9609f0f6e24e8a6be7c4?repository_url=registry.redhat.io/rhdh/rhdh-hub-rhel9

    • workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    • none available: Affected
    Red Hat · CVE-2026-106500 · Updated 2026-10-20T00:14:31+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@sha256:ca5c8160a6cb0fa122c3cc91852325af72b9713db1c2683b68e91433b762e604?repository_url=registry.redhat.io/ansible-automation-platform/automation-portal

    • workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    • none available: Affected
    Red Hat · CVE-2026-106500 · Updated 2026-10-20T00:14:31+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@sha256:58480702819796209b8cda6fe1b53ad78870575432da34ecfdc20cd446c8d81b?repository_url=registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9

    • workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    • none available: Affected
    Red Hat · CVE-2026-106500 · Updated 2026-10-20T00:14:31+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxfoundationBackstage\/Plugin Scaffolder Backend< 3.3.1
LinuxfoundationBackstage\/Plugin Scaffolder Backend≥ 3.4.0 and < 3.4.1
LinuxfoundationBackstage\/Plugin Scaffolder Backend≥ 4.0.0 and < 4.0.3
LinuxfoundationBackstage\/Plugin Scaffolder Backend≥ 4.0.4 and < 4.1.0
LinuxfoundationBackstage< 1.49.6
LinuxfoundationBackstage≥ 1.50.0 and < 1.50.5
LinuxfoundationBackstage≥ 1.51.0 and < 1.54.6

All CVSS metrics

  • HIGH 8.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
  • HIGH 8.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS