{"id":"CVE-2026-106509","revision":"5cc31e26d8fb4de6baa50aacf7e5bd9a","records":[{"revision":"5cc31e26d8fb4de6baa50aacf7e5bd9a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-106509","aliases":[],"title":"Backstage: Improper validation of MkDocs theme configuration in TechDocs","description":"Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.","state":0,"publishedAt":"2026-10-06T21:50:07.721+00:00","modifiedAt":"2026-10-07T18:01:48.511+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:H/PR:L/UI:N/S:C/C:H/I:L/A:L","score":7.7,"severity":"HIGH"}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5c","https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb","https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d","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-2026-106509","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-106509","identifiers":["CVE-2026-106509"]},"retained":false,"historicalAffected":[]}],"coverage":[]}