CVE-2026-53521
Nezha Monitoring: Stored future DDNS profile ID allows unauthorized use of another user's DDNS profile context
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.
INFO
Published Date :
June 12, 2026, 10:16 p.m.
Last Modified :
Oct. 25, 2026, 11:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Nezha Monitoring to version 2.1.0 or later.
- Ensure DDNS profile IDs are validated.
- Restrict server ownership checks.
- Implement proper authorization controls.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53521.
| URL | Resource |
|---|---|
| https://github.com/nezhahq/nezha/security/advisories/GHSA-39g2-8x68-pmx8 | |
| https://github.com/nezhahq/nezha/security/advisories/GHSA-39g2-8x68-pmx8 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53521 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53521
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53521 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53521 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: nezha de nezhahq, Description: Nezha Monitoring es una herramienta autoalojable y ligera para el monitoreo de servidores y sitios web, y para O&M. Desde la versión 2.0.14 hasta antes de la versión 2.1.0, PATCH /server/{id} acepta y persiste IDs de ddns_profiles inexistentes para un servidor propiedad de un miembro. Si otro usuario crea posteriormente un perfil DDNS con uno de esos IDs, el worker de DDNS resuelve el ID almacenado y despacha una actualización utilizando la configuración del perfil DDNS del otro usuario en el contexto del servidor del atacante. Este problema ha sido parcheado en la versión 2.1.0. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'nezhahq', 'product': 'nezha', 'versions': [{'status': 'affected', 'version': '>= 2.0.14, < 2.1.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-53521', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-15T15:13:18.031987Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 15, 2026
Action Type Old Value New Value Added Reference https://github.com/nezhahq/nezha/security/advisories/GHSA-39g2-8x68-pmx8 -
New CVE Received by [email protected]
Jun. 12, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L Added CWE CWE-863 Added Reference https://github.com/nezhahq/nezha/security/advisories/GHSA-39g2-8x68-pmx8