CVE-2026-53521: CWE-863: Incorrect Authorization in nezhahq nezha
Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 2.0.14 to before version 2.1.0, PATCH /server/{id} accepts and persists nonexistent ddns_profiles IDs for a member-owned server. If another user later creates a DDNS profile with one of those IDs, the DDNS worker resolves the stored ID and dispatches an update using the other user's DDNS profile configuration in the context of the attacker's server. This issue has been patched in version 2.1.0.
AI Analysis
Technical Summary
CVE-2026-53521 is an incorrect authorization vulnerability (CWE-863) in Nezha Monitoring, a self-hosted servers and websites monitoring tool. In versions >=2.0.14 and <2.1.0, the PATCH /server/{id} API endpoint allows a user to persist nonexistent ddns_profiles IDs for their server. If another user subsequently creates a DDNS profile with one of these IDs, the DDNS worker resolves the stored ID and dispatches updates using the other user's DDNS profile configuration but in the context of the attacker's server. This can lead to unintended use of another user's DDNS profile configuration. The vulnerability was patched in version 2.1.0.
Potential Impact
The vulnerability allows an attacker to cause the system to use another user's DDNS profile configuration for their own server by exploiting the acceptance and persistence of nonexistent ddns_profiles IDs. This results in incorrect authorization where the attacker's server can leverage another user's DDNS profile updates, potentially impacting integrity and availability of the monitoring service. There is no confidentiality impact reported. No known exploits in the wild have been documented.
Mitigation Recommendations
A fix is available in Nezha Monitoring version 2.1.0. Users should upgrade to version 2.1.0 or later to remediate this vulnerability. Patch status is confirmed by the vendor advisory indicating the issue is fixed in 2.1.0. No additional mitigation actions are specified.
CVE-2026-53521: CWE-863: Incorrect Authorization in nezhahq nezha
Description
Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 2.0.14 to before version 2.1.0, PATCH /server/{id} accepts and persists nonexistent ddns_profiles IDs for a member-owned server. If another user later creates a DDNS profile with one of those IDs, the DDNS worker resolves the stored ID and dispatches an update using the other user's DDNS profile configuration in the context of the attacker's server. This issue has been patched in version 2.1.0.
CVSS v3.1
Score 6.4medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53521 is an incorrect authorization vulnerability (CWE-863) in Nezha Monitoring, a self-hosted servers and websites monitoring tool. In versions >=2.0.14 and <2.1.0, the PATCH /server/{id} API endpoint allows a user to persist nonexistent ddns_profiles IDs for their server. If another user subsequently creates a DDNS profile with one of these IDs, the DDNS worker resolves the stored ID and dispatches updates using the other user's DDNS profile configuration but in the context of the attacker's server. This can lead to unintended use of another user's DDNS profile configuration. The vulnerability was patched in version 2.1.0.
Potential Impact
The vulnerability allows an attacker to cause the system to use another user's DDNS profile configuration for their own server by exploiting the acceptance and persistence of nonexistent ddns_profiles IDs. This results in incorrect authorization where the attacker's server can leverage another user's DDNS profile updates, potentially impacting integrity and availability of the monitoring service. There is no confidentiality impact reported. No known exploits in the wild have been documented.
Mitigation Recommendations
A fix is available in Nezha Monitoring version 2.1.0. Users should upgrade to version 2.1.0 or later to remediate this vulnerability. Patch status is confirmed by the vendor advisory indicating the issue is fixed in 2.1.0. No additional mitigation actions are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-09T17:30:33.456Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2c7c93e617e2d834c6c81a
Added to database: 06/12/2026, 21:39:31 UTC
Last enriched: 06/19/2026, 22:21:52 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 107
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