What’s Vulnerable › Vulnerabilities

CVE-2026-84715: FeatherPanel before 1.3.7.10 Privilege Escalation via Subuser Permission Update

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-10
• Weakness: CWE-862

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.

Affected products

• MythicalLTD FeatherPanel: before 1.3.7.10 — fixed in 1.3.7.10

How to fix

Upgrade to a fixed version: MythicalLTD FeatherPanel 1.3.7.10. Check the vendor advisory for mitigations.

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

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