---
id: CVE-2026-108261
title: Tina is a headless content management system
summary: >-
  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 ifra…
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-346
  - CWE-441
  - CWE-601
vendor: tinacms
product: tinacms
affected:
  - tinacms <= 3.13.0
  - '@tinacms/app <= 2.5.13'
patched:
  - tinacms 3.14.0
  - '@tinacms/app 2.5.14'
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T21:17:04.347'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108261'
references:
  - url: >-
      https://github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf
    label: security-advisories@github.com
  - url: 'https://github.com/tinacms/tinacms/pull/7522'
    label: security-advisories@github.com
  - url: 'https://github.com/tinacms/tinacms/releases/tag/@tinacms/app@2.5.14'
    label: security-advisories@github.com
  - url: 'https://github.com/tinacms/tinacms/releases/tag/tinacms@3.14.0'
    label: security-advisories@github.com
  - url: 'https://github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-x34j-47hf-4xg7'
tags:
  - nvd
  - ghsa
  - npm
aliases:
  - GHSA-x34j-47hf-4xg7
ecosystem: npm
ingestedAt: '2026-10-09T21:12:42.322Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-108261)

Affected packages:

- `tinacms <= 3.13.0`
- `@tinacms/app <= 2.5.13`

Patched in:

- `tinacms 3.14.0`
- `@tinacms/app 2.5.14`

Source: https://github.com/advisories/GHSA-x34j-47hf-4xg7