CVE-2026-34528 File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution
Unauthenticated users can gain shell execution rights if signup and server-side execution are enabled with specific default permissions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34528?
CVE-2026-34528 is a high-severity vulnerability in filebrowser, published on 1 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to version 2.62.2, the signupHandler in File Browser applies default user permissions via d.settings.Defaults.Apply(user), then strips only Admin. The Execute permission and Commands list from the default user template are not stripped. When an administrator has enabled signup, server-side execution, and set Execute=true in the default user template, any unauthenticated user who self-registers inherits shell execution capabilities and can run arbitrary commands on the server. This issue has been patched in version 2.62.2.
Weakness: CWE-269
Which versions are affected by CVE-2026-34528?
4 open source packages ship an affected version, including github.com/filebrowser/filebrowser/v2 and github.com/filebrowser/filebrowser. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.62.2 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.62.2 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.62.2 |
github.com/filebrowser/filebrowser Go | All versions | None |
Products include Filebrowser Filebrowser.
How do I fix CVE-2026-34528?
Upgrade github.com/filebrowser/filebrowser/v2 to 2.62.2 or later.
Is CVE-2026-34528 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34528 exists.
Other vulnerabilities in filebrowser
- CVE-2026-32760 File Browser Self Registration Grants Any User Admin Access When Default Permissions Include Admin
- CVE-2026-29188 File Browser: TUS Delete Endpoint Bypasses Delete Permission Check
- CVE-2023-39612 Cross-site scripting in n/a
- CVE-2026-30934 FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
- CVE-2021-46398 Cross-Site Request Forgery in Filebrowser
Sources
Also known as GHSA-x8jc-jvqm-pm3f, GO-2026-5747.