CVE-2026-53520 Nezha Monitoring: Authenticated users can claim the dashboard Host through NAT and preempt all dashboard routing
Authenticated users can claim the dashboard host via NAT, preempting routing and gaining unauthorized control over the monitoring interface.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53520?
CVE-2026-53520 is a medium-severity missing authorization vulnerability in nezhahq nezha, published on 12 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-284
Which versions are affected by CVE-2026-53520?
3 open source packages ship an affected version, including github.com/nezhahq/nezha.
| Package | Affected | Fixed in |
|---|---|---|
github.com/nezhahq/nezha Go | All versions | None |
github.com/nezhahq/nezha Go | From 2.0.14 | 2.1.0 |
github.com/nezhahq/nezha Go | From 2.0.14 | 2.1.0 |
How do I fix CVE-2026-53520?
Upgrade github.com/nezhahq/nezha to 2.1.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-53520 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53520 exists.
Sources
Also known as GHSA-x6fg-52vr-hj4w, GO-2026-5824.