CVE-2026-84715

FeatherPanel before 1.3.7.10 Privilege Escalation via Subuser Permission Update

State: Published
Severity: 8.7 High
Published: Sep 2, 2026
Updated: Sep 24, 2026
Reserved: Sep 2, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	VulnCheck
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
FeatherPanelMythicalLTD	before 1.3.7.10Affected

References

Patch Commitpatch
FeatherPanel v1.3.7.10 Release Notesrelease-notes
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Controllers/User/Server/SubuserController.php#L454technical-description
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Helpers/ServerGateway.phptechnical-description
https://github.com/MythicalLTD/FeatherPanelproduct
VulnCheck Advisory: FeatherPanel before 1.3.7.10 Privilege Escalation via Subuser Permission Updatethird-party-advisory

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