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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-50186 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50186 exists.
Sources
Also known as GHSA-rv7w-hhqv-65cf.