CVE-2026-33032

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-30. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 36%CVSS: 9.8Exploit: Elevated riskExposed: 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 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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
36%
EPSS %ILE
98%
KEV
Not listed

Published

March 30, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Unauthenticated MCP Endpoint Allows Remote Nginx Takeover · Advisory · 0xJacky/nginx-ui · GitHub

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf
generic🟡 PoC Available

CVE-2026-33032: Unauthenticated nginx-ui MCP takeover

https://websec.net/blog/cve-2026-33032-unauthenticated-nginx-ui-mcp-takeover-69e1200f9fceb1f3fbe9c47f

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-UI———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 27× 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 210 total refreshes for this CVE.

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCkeraattin/CVE-2026-33032
    First seen Apr 18, 2026

    One missing function call on the route registration was enough to turn the MCP interface into an unauthenticated RCE gateway.

    Open source ↗
  • GitHub PoCTwinson333/cve-2026-33032-scanner
    First seen Apr 3, 2026

    Non-destructive vulnerability scanner for Nginx-UI MCP Endpoint Authentication Bypass (CVE-2026-33032)

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-33032.yaml
    First seen Jan 1, 2026

    Nginx UI - Broken Access Control

    Open source ↗

Frequently asked(5)

What is CVE-2026-33032?
CVE-2026-33032 is a critical vulnerability published on March 30, 2026. 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 /mcpmessage. While /mcp requires both IP whitelisting and authentication (AuthRequired() middleware), the /mcpmessage…
When was CVE-2026-33032 disclosed?
CVE-2026-33032 was first published in the National Vulnerability Database on March 30, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33032 actively exploited?
CVE-2026-33032 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36% probability of exploitation in the next 30 days, which ranks it in the top 1.6% of all scored CVEs.
What is the CVSS score of CVE-2026-33032?
CVE-2026-33032 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-33032?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33032, 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.

Dependency Blast Radius

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