CVE-2026-28791: Tina: Path Traversal in Media Upload Handle

March 12, 2026

A path traversal vulnerability (CWE-22) exists in the TinaCMS development server’s media upload handler. The code at media.ts:42-43 joins user-controlled path segments using path.join() without validating that the resulting path stays within the intended media directory. This allows writing files to arbitrary locations on the filesystem.

Attack Vector: Network (HTTP POST request) Impact: Arbitrary file write, potential Remote Code Execution

References

github.com/advisories/GHSA-5hxf-c7j4-279c
github.com/tinacms/tinacms
github.com/tinacms/tinacms/security/advisories/GHSA-5hxf-c7j4-279c
nvd.nist.gov/vuln/detail/CVE-2026-28791

Code Behaviors & Features

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