{"id":"CVE-2026-108261","published":"2026-10-09T21:17:04.347","lastModified":"2026-10-13T12:17:12.410","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.","cvssScore":9.3,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","cwes":["CWE-346","CWE-441","CWE-601"],"vendors":[],"products":[],"references":[{"url":"https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf","tags":[]},{"url":"https://github.com/tinacms/tinacms/pull/7522","tags":[]},{"url":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14","tags":[]},{"url":"https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0","tags":[]},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","tags":[]},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","tags":[]}],"exploitRefs":[{"url":"https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf","tags":[]},{"url":"https://github.com/tinacms/tinacms/pull/7522","tags":[]},{"url":"https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14","tags":[]},{"url":"https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0","tags":[]},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","tags":[]},{"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7","tags":[]}],"hasPoc":true,"ai":{"summary":"A vulnerability in Tina CMS allows unauthenticated attackers to craft malicious links that trick signed-in editors into loading attacker-controlled content in admin preview frames, enabling the attacker to execute GraphQL operations with the editor's credentials and access or modify protected content.","exploitability":"Easy to exploit with no prerequisites; attackers simply need to send a crafted link to a signed-in editor who will click it and load the malicious iframe in the admin preview area.","blast_radius":"High impact across all Tina CMS installations using affected versions, potentially exposing sensitive content or allowing unauthorized modifications to protected data.","remediation":"Upgrade to tinacms 3.14.0 and @tinacms/app 2.5.14 immediately.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["cms","xss","graphql"],"model":"garnet-coder","analyzedAt":"2026-10-12T08:52:10.940Z"}}