CVE-2026-53520Public exploitNetwork attack vector

Authenticated dashboard denial via unreserved NAT domain

Published Jun 12, 2026 · Updated Jun 12, 2026

Improper access control in Nezha Monitoring 2.0.14 through releases before 2.1.0 allows remote authenticated users to block dashboard access. The createNAT and updateNAT handlers store a caller-controlled NAT domain without reserving the dashboard Host, and the top-level multiplexer consults that global NAT key before normal routes. A non-admin user who owns a server can block matching API, frontend, and gRPC requests; forwarding them also requires the selected agent to remain online.

CVSS severity6.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Nezha Monitoring 2.0.14 through releases before 2.1.0 allows remote authenticated users to block dashboard access. The createNAT and updateNAT handlers store a caller-controlled NAT domain without reserving the dashboard Host, and the top-level multiplexer consults that global NAT key before normal routes. A non-admin user who owns a server can block matching API, frontend, and gRPC requests; forwarding them also requires the selected agent to remain online.

The record

CVE
CVE-2026-53520
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
NezhaHQ
Product
Nezha Monitoring
Classifications
CWE-284, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.0.14, < 2.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

NezhaHQ · Nezha Monitoringversion=>= 2.0.14, < 2.1.0

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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