CVE-2026-53521

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

State: Published
Severity: 6.4 Medium
Published: Jun 12, 2026
Updated: Jun 15, 2026
Reserved: Jun 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	6.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L	GitHub_M

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
nezhanezhahq	>= 2.0.14, < 2.1.0Affected

References

https://github.com/nezhahq/nezha/security/advisories/GHSA-39g2-8x68-pmx8

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