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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-108261
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-09 21:17:04 UTC
Updated2026-10-09 21:17:04 UTC
DescriptionTina 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.

Risk And Classification

Primary CVSS: v3.1 9.3 CRITICAL from [email protected]

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

Problem Types: CWE-346 | CWE-441 | CWE-601 | CWE-346 CWE-346: Origin Validation Error | CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy') | CWE-601 CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
3.1CNADECLARED9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tinacms Tinacms affected < 3.14.0 Not specified
CNA @tinacms App affected < 2.5.14 Not specified

References

ReferenceSourceLinkTags
github.com/tinacms/tinacms/security/advisories/GHSA-x34j-47hf-4xg7 [email protected] github.com
github.com/tinacms/tinacms/commit/b57dbf4b56201aef15cd92caa49fd12ab96bbecf [email protected] github.com
github.com/tinacms/tinacms/releases/tag/@tinacms/[email protected] [email protected] github.com
github.com/tinacms/tinacms/pull/7522 [email protected] github.com
github.com/tinacms/tinacms/releases/tag/[email protected] [email protected] github.com
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