CVE-2026-106456

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{"bugzilla": {"description": "plugin-proxy-backend: plugin-proxy-backend: Authentication bypass via overlapping proxy routes", "id": "2547147", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2547147"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-305", "details": ["Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential requirements. When a parent path permits unauthenticated access and a nested path requires credentials, the parent exemption can also cover requests handled by the nested proxy. An unauthenticated caller may therefore reach the nested upstream through Backstage, including with static upstream credentials configured for that proxy. This issue is fixed in version 0.6.18.", "A flaw was found in the Backstage plugin-proxy-backend package. When overlapping proxy paths are configured with different authentication requirements, access exemptions permitted on a parent route can improperly extend to nested routes that require credentials. A remote, unauthenticated attacker can exploit this flaw to bypass authentication controls and access protected upstream services using the proxy's preconfigured credentials."], "name": "CVE-2026-106456", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Fix deferred", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/bootc-automation-portal-rhel9", "product_name": "Self-service automation portal 2"}], "public_date": "2026-10-06T20:10:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-106456\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-106456\nhttps://github.com/backstage/backstage/commit/9df92923ac32558bb80edeceafd8de780c44e218\nhttps://github.com/backstage/backstage/releases/tag/v1.55.0\nhttps://github.com/backstage/backstage/security/advisories/GHSA-472h-9c5j-prrr"], "threat_severity": "Moderate"}

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