Tina: [Broken Access Control] letting any TinaCloud user authorize against any self-hosted site

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63506
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 21:17:13 UTC
Updated2026-09-30 17:51:56 UTC
DescriptionTina is a headless content management system. Prior to @tinacms/auth 1.1.4 and next-tinacms-azure 15.0.1, isAuthorized accepts a request-controlled clientID and asks isUserAuthorized to validate the bearer token against that selected TinaCloud app instead of the self-hosted site's configured app. An attacker with any TinaCloud account can submit the attacker's own app ID and valid token to a victim endpoint, causing TinaCloudBackendAuthProvider or an affected media authorized callback to accept the attacker's verified status across the tenant boundary. The vulnerable logic is present in packages/@tinacms/auth/src/index.ts and packages/next-tinacms-azure/src/auth.ts. Successful exploitation permits media listing, reading, upload, or deletion and, when TinaCloudBackendAuthProvider is used, GraphQL read, create, update, and delete operations on the victim's content without a victim account or victim interaction. This vulnerability is fixed in @tinacms/auth 1.1.4 and next-tinacms-azure 15.0.1.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.005230000 probability, percentile 0.423880000 (date 2026-10-05)

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tinacms Tinacms affected < 1.1.4 Not specified
CNA @tinacms Auth affected < 1.1.4 Not specified
CNA Tinacms Next-tinacms-azure affected < 15.0.1 Not specified

References

ReferenceSourceLinkTags
github.com/tinacms/tinacms/releases/tag/@tinacms/[email protected] [email protected] github.com
github.com/tinacms/tinacms/security/advisories/GHSA-g74q-6g2f-874x 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/tinacms/tinacms/pull/7168 [email protected] github.com
github.com/tinacms/tinacms/commit/0a927a4f8d228dd05ee7ca4be32899bc190e73af [email protected] github.com
github.com/tinacms/tinacms/releases/tag/[email protected] [email protected] github.com
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