{"id":"CVE-2026-106557","revision":"b50f4c014e0141d7b68a8a32788ae15f","records":[{"revision":"b50f4c014e0141d7b68a8a32788ae15f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-106557","aliases":[],"title":"Backstage: Improper input validation in TechDocs Markdown extension configuration","description":"Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later.","state":0,"publishedAt":"2026-10-07T16:22:53.32+00:00","modifiedAt":"2026-10-07T17:47:16.631+00:00","affected":[{"ecosystem":"Vendor product","name":"backstage","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"backstage\",\n                    \"product\": \"backstage\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.50.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.51.0-next.0, < 1.54.6\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"plugin-techdocs-node","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@backstage\",\n                    \"product\": \"plugin-techdocs-node\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.14.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.15.0, < 1.15.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":7.7,"severity":"HIGH"}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-f7v3-xhm6-w245","https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29","https://github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91","https://github.com/backstage/backstage/releases/tag/v1.50.5","https://github.com/backstage/backstage/releases/tag/v1.54.6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-106557","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-106557","identifiers":["CVE-2026-106557"]},"retained":false,"historicalAffected":[]}],"coverage":[]}