Nezha Monitoring: Stored future DDNS profile ID allows unauthorized use of another user's DDNS profile context
CVE-2026-53521

6.4MEDIUM

Key Information:

Vendor

Nezhahq

Status
Nezha
Vendor
CVE Published:
12 June 2026

What is CVE-2026-53521?

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.

Affected Version(s)

nezha >= 2.0.14, < 2.1.0

References

https://github.com/nezhahq/nezha/security/advisories/GHSA...
x_refsource_CONFIRM

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.