What’s Vulnerable › Vulnerabilities

CVE-2026-34528: File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-01 · updated 2026-06-17
• Weakness: CWE-269

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.

Affected products

• filebrowser: before 2.62.2 — fixed in 2.62.2

How to fix

Upgrade to a fixed version: filebrowser 2.62.2. Check the vendor advisory for mitigations.

References

• https://github.com/filebrowser/filebrowser/releases/tag/v2.62.2
• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-x8jc-jvqm-pm3f
• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-x8jc-jvqm-pm3f

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