EUVD-2026-19782
GHSA-7526-j432-6ppp
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
5DescriptionGitHub Advisory
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, the fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts. This vulnerability is fixed in 2.63.1.
AnalysisAI
Auto-provisioned users in File Browser's proxy authentication flow inherit elevated execution permissions that were explicitly blocked in the self-registration flow, enabling unauthorized command execution. Versions prior to 2.63.1 grant execute capabilities to proxy-auth users from global defaults, bypassing security controls added in commit b6a4fb1. This affects File Browser instances using proxy authentication for automatic user provisioning. No public exploit identified at time of analysis, though EPSS probability warrants attention given the network-accessible attack surface and high confidentiality/integrity impact.
Technical ContextAI
File Browser is a web-based file management application that supports multiple authentication mechanisms including self-registration and proxy authentication (header-based SSO). The vulnerability stems from inconsistent permission initialization across authentication handlers. While commit b6a4fb1 modified the signup handler to strip Execute permissions and Commands from newly created users, the proxy auth handler continued using unmodified global default permissions. This creates a CWE-269 (Improper Privilege Management) condition where the authentication method determines privilege assignment. In proxy auth scenarios, external authentication systems (reverse proxies, SSO gateways) validate users and pass headers to File Browser, which auto-creates accounts on first login. These auto-created accounts inherit full execution capabilities including shell command execution within the File Browser context, contrary to the intended security posture established for self-registered users.
RemediationAI
Upgrade File Browser to version 2.63.1 or later, which applies consistent permission stripping across both signup and proxy authentication handlers. The fix is implemented in pull request https://github.com/filebrowser/filebrowser/pull/5890, ensuring auto-provisioned proxy-auth users no longer inherit execution capabilities from global defaults. Organizations unable to immediately upgrade should disable proxy authentication and migrate to alternative authentication methods, or implement external controls to prevent untrusted users from reaching the proxy authentication endpoint. Review existing user accounts created via proxy authentication since the deployment of commit b6a4fb1 and manually revoke Execute permissions and Commands through the administrative interface. Consult the GitHub security advisory at https://github.com/filebrowser/filebrowser/security/advisories/GHSA-7526-j432-6ppp for additional vendor guidance.
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Linux Enterprise Server 16.1 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Affected |
| openSUSE Leap 15.5 | Affected |
| openSUSE Leap 15.6 | Affected |
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External POC / Exploit Code
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