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CVE-2026-33032

Nginx UI is a web user interface for the Nginx web server. In versions 2.3.5 and prior, the nginx-ui MCP (Model Context Protocol) integration exposes two HTTP endpoints: /mcp and /mcp_message. While /mcp requires both IP whitelisting and authentication (AuthRequired() middleware), the /mcp_message endpoint only applies IP whitelisting - and the default IP whitelist is empty, which the middleware treats as "allow all". This means any network attacker can invoke all MCP tools without authenticatio
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3db78195e168f5032dcbe218912df420c8f8948128c9157d8c56374b88fc6b9c
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:v2:47bec7142bd9966128cd9c2a8073eb772b009f7b3445c567ce4a85924db16cba · sha256:067877f43e4f9e8d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/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:v2:47bec7142bd9966128cd9c2a8073eb772b009f7b3445c567ce4a85924db16cba · sha256:067877f43e4f9e8d… · /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:v2:47bec7142bd9966128cd9c2a8073eb772b009f7b3445c567ce4a85924db16cba · sha256:067877f43e4f9e8d… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47bec7142bd9966128cd9c2a8073eb772b009f7b3445c567ce4a85924db16cba · sha256:067877f43e4f9e8d… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47bec7142bd9966128cd9c2a8073eb772b009f7b3445c567ce4a85924db16cba · sha256:067877f43e4f9e8d… · /containers/adp/0/references/0
{"url":"https://websec.net/blog/cve-2026-33032-unauthenticated-nginx-ui-mcp-takeover-69e1200f9fceb1f3fbe9c47f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47bec7142bd9966128cd9c2a8073eb772b009f7b3445c567ce4a85924db16cba · sha256:067877f43e4f9e8d… · /containers/adp/1/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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