Description
Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server. This is limited to target servers already configured as proxy endpoints and requires Backstage authentication by default. This issue is fixed in version 0.6.17.
Published: 2026-10-06
Score: 6.4 Medium
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-9ghw-48h5-v2w5 Backstage: Improper input validation in proxy-backend
History

Wed, 07 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 06 Oct 2026 21:00:00 +0000

Type Values Removed Values Added
Description Backstage is an open framework for building developer portals. Prior to 0.6.17, the @backstage/plugin-proxy-backend package is affected by improper input validation in proxy-backend. An authenticated Backstage user could craft a request URL that causes the proxy-backend to forward the request to a path outside the configured base path on the target server. This is limited to target servers already configured as proxy endpoints and requires Backstage authentication by default. This issue is fixed in version 0.6.17.
Title Backstage: Improper input validation in proxy-backend
Weaknesses CWE-20
CWE-22
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-07T17:52:11.914Z

Reserved: 2026-10-06T18:46:47.766Z

Link: CVE-2026-106491

cve-icon Vulnrichment

Updated: 2026-10-07T17:52:05.602Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-06T21:17:18.073

Modified: 2026-10-07T18:17:16.360

Link: CVE-2026-106491

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-07T00:15:07Z

Weaknesses
  • CWE-20

    Improper Input Validation

  • CWE-22

    Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')