{"cve":"CVE-2026-108261","nvd":{"published":"2026-10-09T21:17:04.347","modified":"2026-10-16T20:04:29.760","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-346","CWE-441","CWE-601"],"references":["https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf","https://github.com/tinacms/tinacms/pull/7522","https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14","https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0","https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:01.639778232+00:00"},"epss":{"cve":"CVE-2026-108261","score":0.00197,"percentile":0.09323,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-x34j-47hf-4xg7","url":"https://osv.dev/vulnerability/GHSA-x34j-47hf-4xg7","summary":"TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment","modified":"2026-10-09T21:15:05.360447760Z","packages":[{"ecosystem":"npm","name":"tinacms","purl":"pkg:npm/tinacms","ranges":["<3.14.0"],"fixed":["3.14.0"]},{"ecosystem":"npm","name":"@tinacms/app","purl":"pkg:npm/%40tinacms/app","ranges":["<2.5.14"],"fixed":["2.5.14"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}