CVE-2026-63506 PUBLISHED

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

Assigner: GitHub_M
Reserved: 16.07.2026 Published: 16.09.2026 Updated: 16.09.2026

Tina 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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Product Status

Vendor tinacms
Product tinacms
Versions
  • Version < 1.1.4 is affected
Vendor @tinacms
Product auth
Versions
  • Version < 1.1.4 is affected
Vendor tinacms
Product next-tinacms-azure
Versions
  • Version < 15.0.1 is affected

References

Problem Types

  • CWE-639: Authorization Bypass Through User-Controlled Key CWE