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CVE-2026-34604— @tinacms/graphql's `FilesystemBridge` Path Validation Can Be Bypassed via Symlinks or Junctions

Quick assessment

Affected
tinacms tinacms
Exploitation
Public or AI PoC available; prioritize validation
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开源的一个用于 Markdown、MDX 和 JSON 的开源无头 CMS。 TinaCMS 2.2.2之前版本存在安全漏洞，该漏洞源于FilesystemBridge中基于字符串的路径包含检查未解析符号链接目标，可能导致对预期根目录外的文件进行操作。

CVSS 7.1 · High EPSS 0.54% · P43

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes
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I. Basic Information for CVE-2026-34604

Vulnerability Information
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Vulnerability Title
@tinacms/graphql's `FilesystemBridge` Path Validation Can Be Bypassed via Symlinks or Junctions
Source: CVE Program / CVE List V5
Vulnerability Description
Tina is a headless content management system. Prior to version 2.2.2, @tinacms/graphql uses string-based path containment checks in FilesystemBridge. That blocks plain ../ traversal, but it does not resolve symlink or junction targets. If a symlink/junction already exists under the allowed content root, a path like content/posts/pivot/owned.md is still considered "inside" the base even though the real filesystem target can be outside it. As a result, FilesystemBridge.get(), put(), delete(), and glob() can operate on files outside the intended root. This issue has been patched in version 2.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
TinaCMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TinaCMS是Tina开源的一个用于 Markdown、MDX 和 JSON 的开源无头 CMS。 TinaCMS 2.2.2之前版本存在安全漏洞，该漏洞源于FilesystemBridge中基于字符串的路径包含检查未解析符号链接目标，可能导致对预期根目录外的文件进行操作。
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 < 2.2.2 -

II. Public POCs for CVE-2026-34604

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9416 chars
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III. Intelligence Information for CVE-2026-34604

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Patches & Fixes for CVE-2026-34604 (1)

Vendor Advisories for CVE-2026-34604 (1)

Same Patch Batch · tinacms · 2026-04-01 · 3 CVEs total

CVE-2026-33949 8.1 HIGH @tinacms/graphql has Path Traversal that leads to overwrite of arbitrary files
CVE-2026-34603 7.1 HIGH @tinacms/graphql's Media Endpoints Can Escape the Media Root via Symlinks or Junctions

IV. Related Vulnerabilities

Same product: tinacms
Same vendor: tinacms
Same weakness: CWE-22

V. Comments for CVE-2026-34604

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