CVE-2026-108261

CVE-2026-108261 · TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 9.3 · Critical · EPSS 0.2% · Fix available

Published

2026-10-09T20:43:37.580Z

Updated

2026-10-13T11:24:15.591Z

Stack: node

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