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

Quick assessment

Affected
tinacms tinacms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TinaCMS是Tina组织开源的一个内容管理系统。 TinaCMS 2.5.2之前版本存在跨站请求伪造漏洞，该漏洞源于CORS验证不当，对不允许的来源未正确拒绝请求，可能导致跨站请求伪造，攻击者可通过诱导开发者访问恶意页面，使浏览器提交上传请求，将恶意内容写入媒体根目录。

CVSS 6.5 · Medium EPSS 0.26% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
tinacms tinacms < 2.5.2 affected
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I. Basic Information for CVE-2026-63123

Vulnerability Information
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Vulnerability Title
Tina: Cross-origin `POST /media/upload/*` requests can write arbitrary files into the Tina dev server media root
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
TinaCMS 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TinaCMS是Tina组织开源的一个内容管理系统。 TinaCMS 2.5.2之前版本存在跨站请求伪造漏洞，该漏洞源于CORS验证不当，对不允许的来源未正确拒绝请求，可能导致跨站请求伪造，攻击者可通过诱导开发者访问恶意页面，使浏览器提交上传请求，将恶意内容写入媒体根目录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinacms tinacms < 2.5.2 -

II. Public POCs for CVE-2026-63123

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III. Intelligence Information for CVE-2026-63123

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Patches & Fixes for CVE-2026-63123 (2)

Vendor Advisories for CVE-2026-63123 (1)

Vendor Pages for CVE-2026-63123 (1)

IV. Related Vulnerabilities

Same product: tinacms
Same vendor: tinacms
Same weakness: CWE-352

V. Comments for CVE-2026-63123

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