Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M
CVE-2026-59992Tina: Broken Access Control: arbitrary bucket-key write/delete in `next-tinacms-s3` (and sibling production media adapters)
Medium 5.4
In plain English
A medium-severity authorization bypass via user-controlled key in next-tinacms-azure from tinacms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Tina is a headless content management system. Prior to next-tinacms-s3 23.0.4, next-tinacms-dos 23.0.4, next-tinacms-azure 14.0.4, and next-tinacms-cloudinary 26.0.4, the first-party production media adapters pass attacker-controlled object keys to storage SDK upload and delete operations without enforcing the operator's configured mediaRoot. In packages/next-tinacms-s3/src/handlers.ts, createMediaHandler accepts req.query.key for a signed PutObject URL and the DELETE path uses req.query.media as the DeleteObjectCommand key. The same missing key-boundary check exists in packages/next-tinacms-dos/src/handlers.ts, packages/next-tinacms-azure/src/handlers.ts, and packages/next-tinacms-cloudinary/src/handlers.ts. An authenticated CMS editor can therefore create or delete objects anywhere the deployment's storage credential can reach, including other tenants' or non-media objects. These issues are fixed in next-tinacms-s3 23.0.4, next-tinacms-dos 23.0.4, next-tinacms-azure 14.0.4, and next-tinacms-cloudinary 26.0.4.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | next-tinacms-azure | 14.0.4 | GHSA-8mq9-5fw2-5rm4 |
| npm | next-tinacms-cloudinary | 26.0.4 | GHSA-8mq9-5fw2-5rm4 |
| npm | next-tinacms-dos | 23.0.4 | GHSA-8mq9-5fw2-5rm4 |
| npm | next-tinacms-s3 | 23.0.4 | GHSA-8mq9-5fw2-5rm4 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tinacms | tinacms | < 23.0.4 |
| tinacms | next-tinacms-s3 | < 23.0.4 |
| tinacms | next-tinacms-dos | < 23.0.4 |
| tinacms | next-tinacms-azure | < 14.0.4 |
| tinacms | next-tinacms-cloudinary | < 26.0.4 |
Weakness: CWE-639, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
References
- https://github.com/tinacms/tinacms/security/advisories/GHSA-8mq9-5fw2-5rm4 x_refsource_CONFIRM
- https://github.com/tinacms/tinacms/pull/7088 x_refsource_MISC
- https://github.com/tinacms/tinacms/commit/d44558e9b4502d4f4fc2c970d22985339fe2b6ce x_refsource_MISC
- https://github.com/tinacms/tinacms/releases/tag/next-tinacms-s3@23.0.4 x_refsource_MISC