CVE-2026-53521

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 86% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.4
EG Score
6.4(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity64% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 15, 2026

Advisory Details (1)

Auto-updated Jun 13, 2026
Patch available. Sources: github.
github Patch Available

Stored future DDNS profile ID allows unauthorized use of another user's DDNS profile context · Advisory · nezhahq/nezha · GitHub

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

Vendor Advisories for CVE-2026-53521(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/nezhahq/nezha—2.1.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-08-23 09:57 UTCEG score recompute
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-21 10:47 UTCEG score recompute
  5. 2026-08-20 22:55 UTCEPSS rescore
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  11. 2026-08-16 22:47 UTCEG score recompute
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  20. 2026-08-12 07:35 UTCEG score recompute
  21. 2026-08-11 09:20 UTCEG score recompute
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  24. 2026-08-09 13:46 UTCEPSS rescore
  25. 2026-08-09 12:52 UTCEG score recompute
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  1. 2026-08-08 16:37 UTCEPSS rescore
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  5. 2026-08-05 19:54 UTCEG score recompute
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  8. 2026-08-04 15:10 UTCEPSS rescore
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  11. 2026-08-02 07:25 UTCEG score recompute
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  14. 2026-08-01 04:16 UTCEPSS rescore
  15. 2026-07-31 04:37 UTCEG score recompute
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  20. 2026-07-28 15:37 UTCEPSS rescore
  21. 2026-07-27 18:46 UTCEG score recompute
  22. 2026-07-26 20:28 UTCEG score recompute
  23. 2026-07-26 14:54 UTCEPSS rescore
  24. 2026-07-25 14:18 UTCEPSS rescore
  25. 2026-07-24 14:18 UTCEPSS rescore
  26. 2026-07-23 14:18 UTCEPSS rescore
  27. 2026-07-23 03:19 UTCEG score recompute
  28. 2026-07-22 14:08 UTCEPSS rescore
  29. 2026-07-21 15:25 UTCEPSS rescore
  30. 2026-07-20 17:08 UTCEPSS rescore
  31. 2026-07-19 14:31 UTCEPSS rescore
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  35. 2026-07-16 17:03 UTCEPSS rescore
  36. 2026-07-15 16:57 UTCEPSS rescore
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  40. 2026-07-13 06:13 UTCEPSS rescore
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  42. 2026-07-12 05:46 UTCEPSS rescore
  43. 2026-07-11 08:27 UTCEPSS rescore
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  45. 2026-07-09 19:10 UTCEPSS rescore
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  47. 2026-07-08 15:16 UTCEPSS rescore
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  49. 2026-07-07 13:46 UTCEPSS rescore
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  51. 2026-07-06 16:27 UTCEPSS rescore
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  66. 2026-06-27 03:08 UTCEPSS rescore
  67. 2026-06-25 13:49 UTCEPSS rescore
  68. 2026-06-24 14:05 UTCEPSS rescore
  69. 2026-06-23 21:33 UTCEPSS rescore
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  71. 2026-06-22 14:25 UTCEPSS rescore
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  73. 2026-06-21 14:56 UTCEPSS rescore
  74. 2026-06-21 14:56 UTCEPSS rescore
  75. 2026-06-21 01:59 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53521?
CVE-2026-53521 is a medium vulnerability published on June 12, 2026. 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…
When was CVE-2026-53521 disclosed?
CVE-2026-53521 was first published in the National Vulnerability Database on June 12, 2026, with the most recent update on June 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53521 actively exploited?
CVE-2026-53521 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.2% of all scored CVEs.
What is the CVSS score of CVE-2026-53521?
CVE-2026-53521 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-53521?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53521, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53521

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