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

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-12 · updated 2026-06-17
Weakness: CWE-22

Description

Tina is a headless content management system. Prior to 2.1.7, a path traversal vulnerability exists in the TinaCMS development server's media upload handler. The code at media.ts 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. This vulnerability is fixed in 2.1.7.

Affected products

tinacms: before 2.1.7 — fixed in 2.1.7

How to fix

Upgrade to a fixed version: tinacms 2.1.7. Check the vendor advisory for mitigations.

References

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