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CVE-2026-106489

MEDIUM 6.5

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

Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper authorization enforcement for techdocs static content. An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design. This issue is fixed in version 2.2.4.

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 · 21st 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 Techdocs Backend Backstage\/Plugin Techdocs Backend

Weakness (CWE)

  • CWE-22: : Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-862: : Missing Authorization

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-techdocs-backend npm

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

    SEMVER range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 2.2.4
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rg9r-hr7g-5gc2/GHSA-rg9r-hr7g-5gc2.json"
  }
}
    GitHub Advisory Database · GHSA-rg9r-hr7g-5gc2 · Updated 2026-10-07T18:15:13.176895630Z

Vendor product assessments

  • 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: Fix deferred
    Red Hat · CVE-2026-106489 · Updated 2026-10-07T12:02:23+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@sha256:2659ae04974d930322789112efc9181bc7cf3990999a204eba45aec0639f0c3d?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: Fix deferred
    Red Hat · CVE-2026-106489 · Updated 2026-10-07T12:02:23+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: Fix deferred
    Red Hat · CVE-2026-106489 · Updated 2026-10-07T12:02:23+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxfoundationBackstage\/Plugin Techdocs Backend< 2.2.4
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