CVE-2026-42222

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
26.1%
KEV
Not listed

Published

May 4, 2026

Last Modified

May 6, 2026

Advisory Details (1)

Auto-updated May 4, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover · Advisory · 0xJacky/nginx-ui · GitHub

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pq

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
gogithub.com/0xJacky/nginx-ui—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/0xJacky/nginx-ui2.3.5——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 35× 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 125 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-08 15:15 UTCEPSS rescore
  9. 2026-07-07 13:46 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 02:23 UTCEPSS rescore
  13. 2026-07-06 02:23 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-01 15:06 UTCEPSS rescore
  17. 2026-06-30 23:22 UTCEPSS rescore
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-27 03:08 UTCEPSS rescore
  22. 2026-06-25 13:49 UTCEPSS rescore
  23. 2026-06-25 13:49 UTCEPSS rescore
  24. 2026-06-24 14:05 UTCEPSS rescore
  25. 2026-06-23 21:33 UTCEPSS rescore
Show 75 more
  1. 2026-06-22 14:25 UTCEPSS rescore
  2. 2026-06-22 14:25 UTCEPSS rescore
  3. 2026-06-21 14:56 UTCEPSS rescore
  4. 2026-06-21 14:56 UTCEPSS rescore
  5. 2026-06-21 01:59 UTCEPSS rescore
  6. 2026-06-19 19:25 UTCEPSS rescore
  7. 2026-06-18 17:52 UTCEPSS rescore
  8. 2026-06-18 17:52 UTCEPSS rescore
  9. 2026-06-17 17:53 UTCEPSS rescore
  10. 2026-06-16 17:52 UTCEPSS rescore
  11. 2026-06-15 17:49 UTCEPSS rescore
  12. 2026-06-14 20:37 UTCEG score recompute
  13. 2026-06-14 20:37 UTCGHSA enrichment
  14. 2026-06-14 08:02 UTCEG score recompute
  15. 2026-06-14 08:02 UTCGHSA enrichment
  16. 2026-06-13 23:00 UTCEPSS rescore
  17. 2026-06-13 02:28 UTCEG score recompute
  18. 2026-06-13 02:28 UTCGHSA enrichment
  19. 2026-06-12 23:12 UTCEPSS rescore
  20. 2026-06-12 23:12 UTCEPSS rescore
  21. 2026-06-12 05:55 UTCEG score recompute
  22. 2026-06-12 05:55 UTCGHSA enrichment
  23. 2026-06-11 17:19 UTCEG score recompute
  24. 2026-06-11 17:19 UTCGHSA enrichment
  25. 2026-06-11 14:00 UTCEPSS rescore
  26. 2026-06-11 02:36 UTCEG score recompute
  27. 2026-06-11 02:36 UTCGHSA enrichment
  28. 2026-06-10 22:18 UTCEPSS rescore
  29. 2026-06-10 13:22 UTCEPSS rescore
  30. 2026-06-10 13:22 UTCEPSS rescore
  31. 2026-06-10 12:19 UTCEG score recompute
  32. 2026-06-10 12:19 UTCGHSA enrichment
  33. 2026-06-09 23:44 UTCEG score recompute
  34. 2026-06-09 23:44 UTCGHSA enrichment
  35. 2026-06-09 11:09 UTCEG score recompute
  36. 2026-06-09 11:09 UTCGHSA enrichment
  37. 2026-06-08 22:33 UTCEG score recompute
  38. 2026-06-08 22:33 UTCGHSA enrichment
  39. 2026-06-08 14:17 UTCEPSS rescore
  40. 2026-06-08 14:17 UTCEPSS rescore
  41. 2026-06-08 05:59 UTCEG score recompute
  42. 2026-06-08 05:59 UTCGHSA enrichment
  43. 2026-06-07 17:24 UTCEG score recompute
  44. 2026-06-07 17:24 UTCGHSA enrichment
  45. 2026-06-07 15:25 UTCEPSS rescore
  46. 2026-06-07 15:25 UTCEPSS rescore
  47. 2026-06-07 04:49 UTCEG score recompute
  48. 2026-06-07 04:49 UTCGHSA enrichment
  49. 2026-06-06 16:14 UTCEG score recompute
  50. 2026-06-06 16:14 UTCGHSA enrichment
  51. 2026-06-06 13:47 UTCEPSS rescore
  52. 2026-06-06 13:47 UTCEPSS rescore
  53. 2026-06-06 03:38 UTCEG score recompute
  54. 2026-06-06 03:38 UTCGHSA enrichment
  55. 2026-06-05 22:47 UTCEPSS rescore
  56. 2026-06-05 14:51 UTCEG score recompute
  57. 2026-06-05 14:51 UTCGHSA enrichment
  58. 2026-06-05 06:10 UTCEPSS rescore
  59. 2026-06-05 06:10 UTCEPSS rescore
  60. 2026-06-05 02:14 UTCEG score recompute
  61. 2026-06-05 02:14 UTCGHSA enrichment
  62. 2026-06-04 13:35 UTCEG score recompute
  63. 2026-06-04 13:35 UTCGHSA enrichment
  64. 2026-06-04 13:12 UTCEPSS rescore
  65. 2026-06-04 13:12 UTCEPSS rescore
  66. 2026-06-04 00:59 UTCEG score recompute
  67. 2026-06-04 00:59 UTCGHSA enrichment
  68. 2026-06-03 12:22 UTCEG score recompute
  69. 2026-06-03 12:22 UTCGHSA enrichment
  70. 2026-06-02 23:47 UTCEG score recompute
  71. 2026-06-02 23:47 UTCGHSA enrichment
  72. 2026-06-02 11:11 UTCEG score recompute
  73. 2026-06-02 11:11 UTCGHSA enrichment
  74. 2026-06-01 22:35 UTCEG score recompute
  75. 2026-06-01 22:35 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42222?
CVE-2026-42222 is a high vulnerability published on May 4, 2026. Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.
When was CVE-2026-42222 disclosed?
CVE-2026-42222 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42222 actively exploited?
CVE-2026-42222 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42222?
CVE-2026-42222 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-42222?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42222, 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.

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