CVE-2026-53521Public exploitNetwork attack vector

Cross-user DDNS updates via unresolved profile IDs

Published Jun 12, 2026 · Updated Jun 12, 2026

Incorrect authorization in Nezha Monitoring 2.0.14 to before 2.1.0 allows remote authenticated users to trigger cross-user DDNS updates. The server update path persists nonexistent profile IDs, and the DDNS worker later resolves them without rechecking ownership. Exploitation requires a member-owned server and prediction or prebinding of a future ID; credentials remain server-side and DNS changes depend on provider permissions.

CVSS severity6.4
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Nezha Monitoring 2.0.14 to before 2.1.0 allows remote authenticated users to trigger cross-user DDNS updates. The server update path persists nonexistent profile IDs, and the DDNS worker later resolves them without rechecking ownership. Exploitation requires a member-owned server and prediction or prebinding of a future ID; credentials remain server-side and DNS changes depend on provider permissions.

The record

CVE
CVE-2026-53521
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
NezhaHQ
Product
Nezha Monitoring
Classifications
CWE-863, T1565.001
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

6.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-863Incorrect Authorization
T1565.001Stored Data Manipulation

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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