CVE-2026-104478 Formwork before 2.3.13 Path Traversal via BackupController Download and Delete
Authenticated users can read or delete arbitrary files via path traversal in the backup controller, bypassing basename checks.
- 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-2026-104478?
CVE-2026-104478 is a high-severity path traversal vulnerability in getformwork formwork, published on 2 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Formwork before 2.3.13 contains a path traversal vulnerability in BackupController that allows authenticated panel users to read or delete arbitrary files. Attackers with backup download or delete permission can supply a base64-encoded backslash-separated traversal payload that bypasses PHP basename on Linux to access files outside the backup directory.
Weakness: CWE-22
Which versions are affected by CVE-2026-104478?
How do I fix CVE-2026-104478?
No fix has been published for CVE-2026-104478 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-2026-104478 being exploited?
There is no known exploitation of CVE-2026-104478 in the wild and no public exploit code.
Sources
Also known as GHSA-4v26-phwj-4v5r.