How severe is CVE-2026-53520?

CVE-2026-53520 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-53520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53520?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-53520 have an EU (EUVD) identifier?

Yes. CVE-2026-53520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36599.

When was CVE-2026-53520 published?

CVE-2026-53520 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-53520

CVE-2026-53520 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36599
Weakness: CWE-284
Published: 2026-06-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-53520?: 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.
How severe is CVE-2026-53520?: CVE-2026-53520 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-53520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-53520?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-53520 have an EU (EUVD) identifier?: Yes. CVE-2026-53520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36599.
When was CVE-2026-53520 published?: CVE-2026-53520 was published on 2026-06-12 and last updated on 2026-06-17.

References

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

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