CVE-2026-63123

MEDIUM 6.5

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

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-352
Vendor	tinacms
Product	tinacms
Published	Aug 19, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

tinacms / tinacms

< 2.5.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/tinacms/tinacms/security/advisories/GHSA-rgr9-r7mj-mf6x github.com: https://github.com/tinacms/tinacms/pull/7111 github.com: https://github.com/tinacms/tinacms/commit/211997cdb53cbd43638bdee999faa65375cfc260 github.com: https://github.com/tinacms/tinacms/releases/tag/@tinacms/[email protected]