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TI-2026-75132 Aliases CVE-2026-111385

Host header injection in Nezha MCP transfer tools

Priority MEDIUM 61CWE-601Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-601.

Summary

Nezha from 2.1.0 before 2.3.15 contains a host header injection flaw (CWE-601) in mintTransferTool, which builds fs.download_url and fs.upload_url from the unvalidated Host header. An attacker who controls the Host header seen on a victim's MCP request can redirect file uploads or capture one-time download tokens and replay them to exfiltrate files.

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

Description from the CNA

Nezha from 2.1.0 before 2.3.15 contains a host header injection vulnerability in mintTransferTool that builds fs.download_url and fs.upload_url transfer URLs from the unvalidated Host header. Attackers who control the Host header seen on a victim's MCP request can redirect file uploads or capture one-time download tokens and replay them to exfiltrate files.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00238 14th 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
nezhahqnezha2.1.0 to before 2.3.152.3.15Patch availableCNA
  • nezha Vendornezhahq Affected 2.1.0 to before 2.3.15 Fixed in 2.3.15 Patch available CNA

Remediation

Nezha 2.3.15 fixes this issue, so upgrade Nezha to version 2.3.15 or later.

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-2026-75133 Cross-tenant server ID enumeration in Nezha via getServerConfigPriority MEDIUM 57
    Show all 5 records →

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111385
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-21 CISA SSVC decision points changed
  4. 2026-10-21 Priority changed: LOW → MEDIUM

References

Patch 2

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