What is CVE-2026-53521?

CVE-2026-53521 is a medium-severity vulnerability, classified under Incorrect Authorization. CVSS score: 6.4/10. Published 2026-06-12.

How severe is CVE-2026-53521?

Medium severity. CVSS v3 base score is 6.4 out of 10.

CVE-2026-53521

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. I…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L.

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security-advisories@github.com

Frequently asked questions

What is CVE-2026-53521?: CVE-2026-53521 is a medium-severity vulnerability, classified under Incorrect Authorization. CVSS score: 6.4/10. Published 2026-06-12.
How severe is CVE-2026-53521?: Medium severity. CVSS v3 base score is 6.4 out of 10.