CVE-2026-53520: Nezha Monitoring: Authenticated users can claim the dashboard Host through NAT and preempt all dashboard routing

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-12 · updated 2026-10-25
Weakness: CWE-284

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, authenticated users can claim the dashboard Host through NAT and preempt all dashboard routing. This issue has been patched in version 2.1.0.

Affected products

nezhahq nezha: from 2.0.14, < 2.1.0

References

https://github.com/nezhahq/nezha/security/advisories/GHSA-x6fg-52vr-hj4w
https://github.com/nezhahq/nezha/security/advisories/GHSA-x6fg-52vr-hj4w

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