Vulnerability · Published Apr 1, 2026 · Assigned by GitHub_M
CVE-2026-34528File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution
High 8.1
In plain English
A high-severity privilege mismanagement in filebrowser from filebrowser. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/filebrowser/filebrowser | no fix listed | GO-2026-5747 |
| Go | github.com/filebrowser/filebrowser/v2 | 2.62.2 | GHSA-x8jc-jvqm-pm3f |
| Go | github.com/filebrowser/filebrowser/v2 | 2.62.2 | GO-2026-5747 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| filebrowser | filebrowser | < 2.62.2 |
Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/filebrowser/filebrowser/security/advisories/GHSA-x8jc-jvqm-pm3f x_refsource_CONFIRM
- https://github.com/filebrowser/filebrowser/releases/tag/v2.62.2 x_refsource_MISC