{"id":"CVE-2026-108261","revision":"9b631bf865d4461abf18e0f40c1e85b9","records":[{"revision":"9b631bf865d4461abf18e0f40c1e85b9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-108261","aliases":[],"title":"TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment","description":"Tina is a headless content management system. Prior to tinacms 3.14.0 and @tinacms/app 2.5.14, the /~/* admin preview route in packages/tinacms/src/admin/index.tsx can turn an attacker-controlled hash-router splat into an off-origin iframe URL through packages/@tinacms/app/src/preview.tsx, while packages/@tinacms/app/src/lib/preview-origin.ts derives expectedOrigin from that same URL for the GraphQL message channel in packages/@tinacms/app/src/lib/graphql-reducer.ts. An unauthenticated attacker can send a crafted link to a signed-in editor, cause the admin to frame an attacker origin, and have that frame treated as the trusted preview. The attacker-controlled frame can submit GraphQL reads or mutations that the admin executes with the editor credentials, exposing or modifying protected content. This issue is fixed in tinacms 3.14.0 and @tinacms/app 2.5.14.","state":0,"publishedAt":"2026-10-09T20:43:37.58+00:00","modifiedAt":"2026-10-13T11:24:15.591+00:00","affected":[{"ecosystem":"Vendor product","name":"tinacms","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"tinacms\",\n                    \"product\": \"tinacms\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 3.14.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"app","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@tinacms\",\n                    \"product\": \"app\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.5.14\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","score":9.3,"severity":"CRITICAL"}],"references":["https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","https://github.com/tinacms/tinacms/pull/7522","https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf","https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14","https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-108261","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-108261","identifiers":["CVE-2026-108261"]},"retained":false,"historicalAffected":[]}],"coverage":[]}