CVE-2026-33032
Exploitation reported by one source. First attested on 2026-04-15 by GCVE · kevintel.
- Published2026-03-30
- WeaknessCWE-306
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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 authentication, including restarting nginx, creating/modifying/deleting nginx configuration files, and triggering automatic config reloads - achieving complete nginx service takeover. At time of publication, there are no publicly available patches.
Timeline
dates in UTC- 2026-03-3018:16CVE publishedNVD
- 2026-04-1516:05Listed as exploited by GCVEGCVE
- 2026-04-1516:05Exploitation first reportedGCVE
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-33032?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-33032?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.3 | ≤ 2.3.5 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.99 | ≤ 1.99 | no fix published | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- github.comMitigation · Vendor Advisory
Detection
read 2026-10-23 19:25 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 4 repositories, unverifiedTwinson333/cve-2026-33032-scannerShreda/CVE-2026-33032-nginx-ui-vuln-labkeraattin/CVE-2026-33032Baba01hacker666/CVE-2026-33032 PoC-in-GitHub
Sources
- NVDCVE recordread 2026-10-23
- GCVEexploitation2026-04-15
- CISA-ADPSSVC decisionpoc2026-03-30
- OpenCVESSVC decisionpoc—
- CNACVSS 3.19.8read 2026-10-23
- CNAweakness (CWE)CWE-306read 2026-10-23
- FIRST EPSSEPSS score2.5 %2026-10-22
- PoC-in-GitHubproof of concept4read 2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-03-30
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-33032?
Is CVE-2026-33032 actively exploited?
What is the CVSS score for CVE-2026-33032?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.