# CVE-2026-50186: 4gaBoards: Path Traversal leading to Arbitrary File Read and Deletion in Board Export

> An authenticated project manager can exploit path traversal in board exports to read and delete arbitrary files on the server.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Aug 2026
- **Updated:** 25 Aug 2026
- **Also known as:** GHSA-rv7w-hhqv-65cf

## What is CVE-2026-50186?

CVE-2026-50186 is a high-severity path traversal vulnerability in RARgames 4gaBoards, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

4gaBoards is a boards system for realtime project management. Prior to 3.3.8, 4gaBoards allows an authenticated project manager to supply traversal sequences in the filename parameter of GET /exports/:id/:filename. In server/api/controllers/boards/download.js, the decoded inputs.filename value is passed to path.join() beneath private/exports/<user_id>/ without containment validation. A crafted value such as ../ can select an arbitrary file readable by the server process, and the file is returned to the attacker. The fileStream close handler then passes the same path to fs.unlink(), deleting the selected file and potentially causing data loss or denial of service. This issue is fixed in version 3.3.8.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-50186?


## How do I fix CVE-2026-50186?

No fix has been published for CVE-2026-50186 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-50186 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50186 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50186 and fix it if it is affected.

What it is: CVE-2026-50186 is a high-severity path traversal vulnerability in RARgames 4gaBoards, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50186 exists.

Affected product: RARgames 4gaBoards. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-50186/ (Markdown: https://insights.sbomify.com/CVE-2026-50186/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50186
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50186
- OSV: https://osv.dev/vulnerability/CVE-2026-50186

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50186/
Summaries are generated and may contain mistakes; the official description above is the record.