Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M
CVE-2026-63123Tina: Cross-origin `POST /media/upload/*` requests can write arbitrary files into the Tina dev server media root
Medium 6.5
In plain English
A medium-severity cross-site request forgery in tinacms from tinacms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Tina is a headless content management system. Prior to 2.5.2, the TinaCMS CLI package's Vite dev server packages/@tinacms/cli/src/next/vite/cors.ts origin callback returns false for a disallowed origin but does not reject the request, and packages/@tinacms/cli/src/next/vite/plugins.ts still routes POST /media/upload/* to mediaRouter.handlePost. The upload code in packages/@tinacms/cli/src/next/commands/dev-command/server/media.ts writes attacker-controlled multipart contents inside the configured media root. A remote attacker can cause a developer's browser to submit this state-changing request by inducing the developer to visit an attacker-controlled page while tinacms dev is running. This issue is fixed in version 2.5.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @tinacms/cli | 2.5.2 | GHSA-rgr9-r7mj-mf6x |
Affected products (as reported)
Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
References
- https://github.com/tinacms/tinacms/security/advisories/GHSA-rgr9-r7mj-mf6x x_refsource_CONFIRM
- https://github.com/tinacms/tinacms/pull/7111 x_refsource_MISC
- https://github.com/tinacms/tinacms/commit/211997cdb53cbd43638bdee999faa65375cfc260 x_refsource_MISC
- https://github.com/tinacms/tinacms/releases/tag/@tinacms/cli@2.5.2 x_refsource_MISC