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TI-2026-75133 Aliases CVE-2026-111386

Cross-tenant server ID enumeration in Nezha via getServerConfig

Priority MEDIUM 57CWE-204Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-204.

Summary

Nezha from 1.7.0 before 2.3.15 contains an information disclosure flaw that lets authenticated members enumerate other tenants' server IDs. Attackers can sweep sequential IDs against getServerConfig and compare permission denied responses with success responses to map other users' servers (CWE-204). Attackers need only a low-privileged authenticated account, and a proof-of-concept exists according to CISA SSVC.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Nezha from 1.7.0 before 2.3.15 contains an information disclosure vulnerability that allows authenticated members to enumerate other tenants' server IDs through differential responses. Attackers can sweep sequential IDs against getServerConfig and setServerConfig, distinguishing 'permission denied' from success payloads to map other users' servers.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0021 11th percentileScored 2026-11-07
Fix Fixed nezha (nezhahq): 2.3.15

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nezhahqnezha1.7.0 to before 2.3.152.3.15Patch availableCNA
  • nezha Vendornezhahq Affected 1.7.0 to before 2.3.15 Fixed in 2.3.15 Patch available CNA

Remediation

Update Nezha to version 2.3.15 or later. The sources list no fixed version for other Nezha releases beyond 2.3.15 in this range.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA nezha (nezhahq) Fixed in 2.3.15

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    nezhahq nezha 2.3.15

    5 records Highest priority Priority MEDIUM 4 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-75131 Memory exhaustion in Nezha file manager WebSocket endpointPriority MEDIUM 64
    • TI-2026-75130 Nezha WebSocket transfer endpoint flaw enables denial of servicePriority MEDIUM 64
    • TI-2026-75132 Host header injection in Nezha MCP transfer toolsPriority MEDIUM 61
    Show all 5 records →

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111386
  2. 2026-10-16 CISA SSVC decision points changed
  3. 2026-10-16 Priority changed: LOW → MEDIUM

References

Patch 1

Advisory 1

  • TI-2026-65123 Nezha through 2.2.3 Host Header Injection via OAuth2 redirect_uri CVSS 4.0CRITICAL 9.3
  • TI-2026-34341 Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron CVSS 3.1CRITICAL 9.9
  • TI-2026-34342 Nezha Monitoring: RoleMember-reachable SSRF with full response-body reflection via POST /api/v1/notification CVSS 3.1HIGH 7.7
  • TI-2026-38597 Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection CVSS 3.1MEDIUM 6.8
  • TI-2026-75131 Memory exhaustion in Nezha file manager WebSocket endpoint CVSS 4.0HIGH 7.1
  • TI-2026-75130 Nezha WebSocket transfer endpoint flaw enables denial of service CVSS 4.0HIGH 7.1
See all 29 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences