FeatherPanel before 1.3.7.10 Privilege Escalation via Subuser Permission Update

Advisories

FeatherPanel before 1.3.7.10 Privilege Escalation via Subuser Permission Update

severity: high
date: 9/1/2026
Affecting: FeatherPanel >= 0, < 1.3.7.10
CVE: CVE-2026-84715
CWE: CWE-862 Missing Authorization
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: Patch Commit
FeatherPanel v1.3.7.10 Release Notes
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Controllers/User/Server/SubuserController.php#L454
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Helpers/ServerGateway.php
https://github.com/MythicalLTD/FeatherPanel
Credit: Abdurakhmon Kodirov
Description: FeatherPanel versions before 1.3.7.10 fail to validate permissions in the SubuserController updateSubuser handler, allowing authenticated subusers to modify their own permission records. A subuser with minimal permissions can send a crafted request to grant themselves full server control, enabling unauthorized access to sensitive data, backups, and server configuration.

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