Vulnerability · Published Sep 2, 2026 · Assigned by VulnCheck

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

High 8.8

In plain English

A high-severity missing authorization in FeatherPanel from MythicalLTD. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.6%top 52.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
MythicalLTD	FeatherPanel	0 – before 1.3.7.10

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Patch Commit patch
FeatherPanel v1.3.7.10 Release Notes release-notes
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Controllers/User/Server/SubuserController.php#L454 technical-description
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Helpers/ServerGateway.php technical-description
https://github.com/MythicalLTD/FeatherPanel product
VulnCheck Advisory: FeatherPanel before 1.3.7.10 Privilege Escalation via Subuser Permission Update third-party-advisory