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CVE-2026-106498

HIGH 7.7

Published 2026-10-06 · Last modified 2026-10-09

Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.

ELEVATED IMPACT

Severe if exploited (CVSS 7.7), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 23rd percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.7CVSS 3.1 · HIGH

  • 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 Catalog Backend Backstage Plugin Catalog Backend

Weakness (CWE)

  • CWE-863: : Incorrect Authorization
  • CWE-918: : Server-Side Request Forgery (SSRF)

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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-catalog-backend npm

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

    SEMVER range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 3.9.1
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-qgvj-qcf8-xq73/GHSA-qgvj-qcf8-xq73.json"
  }
}
    GitHub Advisory Database · GHSA-qgvj-qcf8-xq73 · Updated 2026-10-07T18:15:10.710570023Z

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

    • none available: Affected
    Red Hat · CVE-2026-106498 · Updated 2026-10-07T06:05:47+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

    • none available: Affected
    Red Hat · CVE-2026-106498 · Updated 2026-10-07T06:05:47+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

    • none available: Affected
    Red Hat · CVE-2026-106498 · Updated 2026-10-07T06:05:47+00:00

Known Affected Software Configurations

VendorProductVersion range
LinuxfoundationBackstage Plugin Catalog Backend< 3.5.1
LinuxfoundationBackstage Plugin Catalog Backend≥ 3.6.0 and < 3.6.2
LinuxfoundationBackstage Plugin Catalog Backend≥ 3.7.0 and < 3.7.2
LinuxfoundationBackstage Plugin Catalog Backend≥ 3.8.0 and < 3.8.2
LinuxfoundationBackstage Plugin Catalog Backend≥ 3.9.0 and < 3.9.1
LinuxfoundationBackstage< 1.49.6
LinuxfoundationBackstage≥ 1.50.0 and < 1.50.5
LinuxfoundationBackstage≥ 1.51.0 and < 1.51.3
LinuxfoundationBackstage≥ 1.52.0 and < 1.53.2
LinuxfoundationBackstage≥ 1.54.0 and < 1.54.6

All CVSS metrics

  • HIGH 7.7 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
  • HIGH 7.7 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS