critical

CVE-2026-108261

TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment

Published 9 Oct 2026Modified 16 Oct 2026CWE 346, 441, 601

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

GHSA9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by GHSA.

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.

Affected packages and fixed versions

Source	Package	Fixed in
npm::GitHub Security Advisory npm	@tinacms/app, tinacms	2.5.14 and 1 more

Show all 2 entries from 1 source

Source	Package	Fixed in
npm::GitHub Security Advisory npm	@tinacms/app	2.5.14
npm::GitHub Security Advisory npm	tinacms	3.14.0

References

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