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CVE-2026-34403

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.5, all WebSocket endpoints in nginx-ui use a gorilla/websocket Upgrader with CheckOrigin unconditionally returning true, allowing Cross-Site WebSocket Hijacking (CSWSH). Combined with the fact that authentication tokens are stored in browser cookies (set via JavaScript without HttpOnly or explicit SameSite attributes), a malicious webpage can establish authenticated WebSocket connections to the nginx-ui instance when
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:263710678a819c18fb36d6be0f09fe9c9fe6c24245a7fb1d6d80ad63511a1ab3
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":"< 2.3.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1ecc261a59827ee4a64e50ad16f28af30618e248a0a261e40be4c050ed466925 · sha256:d1c8dd6514e4a114… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.5,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1ecc261a59827ee4a64e50ad16f28af30618e248a0a261e40be4c050ed466925 · sha256:d1c8dd6514e4a114… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-1385","description":"CWE-1385: Missing Origin Validation in WebSockets","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1ecc261a59827ee4a64e50ad16f28af30618e248a0a261e40be4c050ed466925 · sha256:d1c8dd6514e4a114… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.5","tags":["x_refsource_MISC"],"url":"https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1ecc261a59827ee4a64e50ad16f28af30618e248a0a261e40be4c050ed466925 · sha256:d1c8dd6514e4a114… · /containers/cna/references/1
{"name":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-78mf-482w-62qj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-78mf-482w-62qj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1ecc261a59827ee4a64e50ad16f28af30618e248a0a261e40be4c050ed466925 · sha256:d1c8dd6514e4a114… · /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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