CVE-2026-84715

EUVD-2026-69798
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 24.37%
Common Weakness Enumeration
References
https://github.com/MythicalLTD/FeatherPanel
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/commit/06ef8dcac471201748516ca743694159cb846a9d
https://github.com/MythicalLTD/FeatherPanel/releases/tag/v1.3.7.10
https://www.vulncheck.com/advisories/featherpanel-before-1.3.7.10-privilege-escalation-via-subuser-permission-update