CVE-2026-63123: Tinacms

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Tinacms Tinacms: before 2.5.2 (fixed in 2.5.2)

Published 2026-08-19. Last modified 2026-09-10.