CVE-2026-108261

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.

• CWE-346
• CWE-441
• CWE-601

• 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
• https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7

Published

Oct 9, 2026

Last Modified

Oct 16, 2026

Status

Deferred

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