CVE-2026-63506 Tina: [Broken Access Control] letting any TinaCloud user authorize against any self-hosted site
Attackers with any TinaCloud account can bypass tenant isolation to read, modify, or delete content on self-hosted TinaCMS sites.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63506?
CVE-2026-63506 is a high-severity missing authorization vulnerability in @tinacms auth, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-63506?
4 open source packages ship an affected version, including @tinacms/auth and next-tinacms-azure.
| Package | Affected | Fixed in |
|---|---|---|
@tinacms/auth npm | All versions | 1.1.4 |
@tinacms/auth npm | All versions | 1.1.4 |
next-tinacms-azure npm | All versions | 15.0.1 |
next-tinacms-azure npm | All versions | 15.0.1 |
How do I fix CVE-2026-63506?
Upgrade @tinacms/auth to 1.1.4 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-63506 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63506 exists.
Sources
Also known as GHSA-g74q-6g2f-874x.