High severity · published Sep 2, 2026
CVE-2026-84715
FeatherPanel before 1.3.7.10 Privilege Escalation via Subuser Permission Update
8.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
FeatherPanel · MythicalLTD
before 1.3.7.10 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84715
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84715
github.com
https://github.com/MythicalLTD/FeatherPanel
github.com
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Controllers/User/Server/SubuserController.php#L454
github.com
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Helpers/ServerGateway.php
github.com
https://github.com/MythicalLTD/FeatherPanel/commit/06ef8dcac471201748516ca743694159cb846a9d
github.com
https://github.com/MythicalLTD/FeatherPanel/releases/tag/v1.3.7.10
www.vulncheck.com
https://www.vulncheck.com/advisories/featherpanel-before-1.3.7.10-privilege-escalation-via-subuser-permission-update