EUVD-2026-19782
GHSA-7526-j432-6ppp
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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Description
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.
Analysis
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. …
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Remediation
Within 24 hours: Inventory all File Browser deployments and identify those using proxy authentication for user provisioning. Within 7 days: Disable automatic user provisioning via proxy authentication if operationally feasible, or restrict proxy authentication to trusted networks only. …
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