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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.

Tina 是一个无头内容管理系统。在版本 2.5.2 之前，TinaCMS CLI 包的 Vite 开发服务器中，文件 的 Origin 回调函数在检测到不允许的 Origin 时仅返回 false，但并未拒绝该请求；同时，文件 仍会将 POST /media/upload/* 请求路由到 mediaRouter.handlePost 进行处理。文件 中的上传代码会将攻击者控制的 multipart 内容写入配置好的媒体根目录。远程攻击者可通过诱导开发人员访问一个由攻击者控制的网页（在 TinaCMS 开发服务器运

CVSS 6.5 · Medium EPSS 0.20% · P10

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

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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