CVE-2026-35585 File Browser has a Command Injection via Hook Runner
An attacker with file write permissions can execute arbitrary OS commands via malicious filenames in the hook system, requiring the feature to be enabled.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-35585?
CVE-2026-35585 is a high-severity command injection vulnerability in filebrowser, published on 7 Apr 2026. An attacker needs administrator access to exploit it, 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. From 2.0.0 until 2.33.8, the hook system in File Browser — which executes administrator-defined shell commands on file events such as upload, rename, and delete — is vulnerable to OS command injection. Variable substitution for values like $FILE and $USERNAME is performed via os.Expand without sanitization. An attacker with file write permission can craft a malicious filename containing shell metacharacters, causing the server to execute arbitrary OS commands when the hook fires. This results in Remote Code Execution (RCE). This feature has been disabled by default for all installations from v2.33.8 onwards, including for existent installations.
Which versions are affected by CVE-2026-35585?
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 | 2.33.8 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.33.8 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.33.8 |
github.com/filebrowser/filebrowser Go | All versions | None |
Products include Filebrowser Filebrowser.
How do I fix CVE-2026-35585?
Upgrade github.com/filebrowser/filebrowser/v2 to 2.33.8 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-35585 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35585 exists.
Public exploit code: 1 proofs of concept on GitHub.
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-jvpw-637p-h3pw, GO-2026-5481.