What’s Vulnerable › Vulnerabilities

CVE-2026-63123: Tina: Cross-origin `POST /media/upload/*` requests can write arbitrary files into the Tina dev server media root

• Severity: medium (CVSS 6.5 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: none known
• Published: 2026-08-19 · updated 2026-10-26
• Weakness: CWE-352

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 products

• tinacms: before 2.5.2

References

• https://github.com/tinacms/tinacms/commit/211997cdb53cbd43638bdee999faa65375cfc260
• https://github.com/tinacms/tinacms/pull/7111
• https://github.com/tinacms/tinacms/releases/tag/@tinacms/cli@2.5.2
• https://github.com/tinacms/tinacms/security/advisories/GHSA-rgr9-r7mj-mf6x
• https://github.com/tinacms/tinacms/security/advisories/GHSA-rgr9-r7mj-mf6x

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