CVE-2026-106503

{"id": "CVE-2026-106503", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-106503", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-09T01:55:45.447568Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "backstage", "product": "backstage", "versions": [{"status": "affected", "version": "< 1.49.6"}, {"status": "affected", "version": ">= 1.50.0-next.0, < 1.50.5"}, {"status": "affected", "version": ">= 1.51.0-next.0, < 1.54.6"}]}, {"vendor": "@backstage", "product": "plugin-scaffolder-backend", "versions": [{"status": "affected", "version": "< 3.3.1"}, {"status": "affected", "version": ">= 3.4.0, < 3.4.1"}, {"status": "affected", "version": ">= 4.0.0, < 4.0.3"}, {"status": "affected", "version": ">= 4.0.4, < 4.1.0"}]}]}], "published": "2026-10-06T22:17:05.513", "references": [{"url": "https://github.com/backstage/backstage/commit/11c1384c0649b8ab26391c6a4e4f34b80ab0d188", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/backstage/backstage/commit/a91ed72d540e80b62a73b39bb1563ff5018d52d1", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/backstage/backstage/commit/e307e4f487103d815e484291b3fda778ab9983bf", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/backstage/backstage/releases/tag/v1.49.6", "tags": ["Patch", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/backstage/backstage/releases/tag/v1.50.5", "tags": ["Patch", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/backstage/backstage/releases/tag/v1.54.6", "tags": ["Patch", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-178"}, {"lang": "en", "value": "CWE-284"}]}], "descriptions": [{"lang": "en", "value": "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 scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0."}], "lastModified": "2026-10-13T14:37:56.910", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:backstage\\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1E40C96F-E2DC-4066-8F97-A2A0E669075E", "versionEndExcluding": "3.3.1"}, {"criteria": "cpe:2.3:a:linuxfoundation:backstage\\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E52510C2-B9A3-4309-9CD6-537E7F142C00", "versionEndExcluding": "3.4.1", "versionStartIncluding": "3.4.0"}, {"criteria": "cpe:2.3:a:linuxfoundation:backstage\\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FE34FC94-86CE-48AE-8E79-C5E5C4FB5FE9", "versionEndExcluding": "4.0.3", "versionStartIncluding": "4.0.0"}, {"criteria": "cpe:2.3:a:linuxfoundation:backstage\\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E42114C6-ECBB-46A3-BB2B-BF154CA7D7B1", "versionEndExcluding": "4.1.0", "versionStartIncluding": "4.0.4"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8D095FA7-D58D-4B37-84B2-0E565FF215C1", "versionEndExcluding": "1.49.6"}, {"criteria": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DC5B9818-20D9-4507-80D2-6242DED888AE", "versionEndExcluding": "1.50.5", "versionStartIncluding": "1.50.0"}, {"criteria": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C8071EEF-6BEF-4AC1-B333-CCFC0FFFA72E", "versionEndExcluding": "1.54.6", "versionStartIncluding": "1.51.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}