Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron
Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.4.0 to before version 2.0.8, a RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook. This issue has been patched in version 2.0.8.
Problem Types
| Type | CWE ID | Description |
|---|
| CWE | CWE-78 | CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') |
| CWE | CWE-269 | CWE-269: Improper Privilege Management |
| CWE | CWE-862 | CWE-862: Missing Authorization |
Type: CWE
Description: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Type: CWE
Description: CWE-269: Improper Privilege Management
Type: CWE
Description: CWE-862: Missing Authorization
Metrics
| Version | Base score | Base severity | Vector |
|---|
| 3.1 | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Version: 3.1
Base score: 9.9
Base severity: CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H