CVE-2026-63506: @tinacms Auth

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• @tinacms Auth: before 1.1.4 (fixed in 1.1.4)
• Tinacms Next-Tinacms-Azure: before 15.0.1 (fixed in 15.0.1)
• Tinacms Tinacms: before 1.1.4 (fixed in 1.1.4)

Published 2026-09-16. Last modified 2026-09-30.