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CVE-2026-42221

Nginx UI is a web user interface for the Nginx web server. From version 2.0.0 to before version 2.3.8, an unauthenticated network attacker can claim the initial administrator account on a fresh nginx-ui instance during the first-run setup window. The public /api/install endpoint is reachable without authentication, and the request-encryption flow only protects payload confidentiality in transit; it does not authenticate who is allowed to perform installation. A remote attacker who reaches the se
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7b03cc6c429ddc720b8ae062c6d5eb1375dcebc44d331d979f5def818a98f676
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"nginx-ui","vendor":"0xJacky","versions":[{"status":"affected","version":">= 2.0.0, < 2.3.8"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e06a454a1805b699c8435de922be281ea0cdbed735b2baf411b52728b0df87a6 · sha256:6f53ad6a343982bd… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e06a454a1805b699c8435de922be281ea0cdbed735b2baf411b52728b0df87a6 · sha256:6f53ad6a343982bd… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:e06a454a1805b699c8435de922be281ea0cdbed735b2baf411b52728b0df87a6 · sha256:6f53ad6a343982bd… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8","tags":["x_refsource_MISC"],"url":"https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e06a454a1805b699c8435de922be281ea0cdbed735b2baf411b52728b0df87a6 · sha256:6f53ad6a343982bd… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e06a454a1805b699c8435de922be281ea0cdbed735b2baf411b52728b0df87a6 · sha256:6f53ad6a343982bd… · /containers/adp/0/references/0
{"name":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e06a454a1805b699c8435de922be281ea0cdbed735b2baf411b52728b0df87a6 · sha256:6f53ad6a343982bd… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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