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Vulnerability record · CVE-2026-84715 · published 2 September 2026

CVE-2026-84715: Missing authorization vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.56% · top 55.3% CWE-862 · Missing authorization Deferred
8.7CVSS 4.0 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
10 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/MythicalLTD/FeatherPanel
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Controllers/User/S
https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Helpers/ServerGate
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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Source: NIST National Vulnerability Database (record CVE-2026-84715), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.