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

Quick assessment

Affected
tinacms tinacms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tina 是一个无头内容管理系统。在 tinacms 3.14.0 和 @tinacms/app 2.5.14 版本之前，packages/tinacms/src/admin/index.tsx 中的 /~/* 管理员预览路由可能会将攻击者控制的 hash-router 通配符路径转换为一个非同源 iframe URL。该 URL 通过 packages/@tinacms/app/src/preview.tsx 传递，并且 packages/@tinacms/app/src/lib/preview-origin.t

CVSS 9.3 · Critical
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I. Basic Information for CVE-2026-108261

Vulnerability Information
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Vulnerability Title
TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinacms tinacms < 3.14.0 -
@tinacms app < 2.5.14 -

II. Public POCs for CVE-2026-108261

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III. Intelligence Information for CVE-2026-108261

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Other References for CVE-2026-108261 (5)

Same Patch Batch · tinacms · 2026-10-09 · 3 CVEs total

CVE-2026-108259 8.2 HIGH Tina: Code injection via unescaped Git branch name in generated client source
CVE-2026-108260 7.6 HIGH @tinacms/web-components: `tina-markdown` writes rich-text link URLs into `href` without sc

IV. Related Vulnerabilities

Same product: tinacms
Same vendor: tinacms
Same weakness: CWE-346

V. Comments for CVE-2026-108261

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