PT-2026-47620 · Go · Github.Com/Juev/Nebula-Mesh

Published

2026-06-08

·

Updated

2026-06-08

·

CVE-2026-47723

CVSS v4.0

7.1

High

VectorAV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
None of the response paths in internal/web/ or internal/api/ set the standard browser-security headers. grep for Content-Security-Policy, X-Frame-Options, Strict-Transport-Security, X-Content-Type-Options, Referrer-Policy returns zero matches across the codebase.

Impact

The admin UI signs CA certificates, mints API keys (returned inline once per page), displays TOTP QR codes, and exposes operator-management forms. Missing X-Frame-Options: DENY / frame-ancestors 'none' is a real clickjacking lever against an admin browsing /ui/operators/* or /ui/cas/*. Missing X-Content-Type-Options: nosniff allows MIME confusion on any user-supplied content surface. Missing HSTS on TLS deployments leaves a downgrade window.

Affected

All released versions up to v0.3.0.

Suggested fix

A single response-header middleware mounted at the chi router root in both /ui/* and /api/* paths:
func securityHeadersMiddleware(next http.Handler) http.Handler {
  return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
    h := rw.Header()
    h.Set("Content-Security-Policy",
      "default-src 'self'; frame-ancestors 'none'; base-uri 'none'; form-action 'self'")
    h.Set("X-Content-Type-Options", "nosniff")
    h.Set("Referrer-Policy", "same-origin")
    h.Set("X-Frame-Options", "DENY") // belt-and-braces; CSP frame-ancestors is the modern path
    if r.TLS != nil {
      h.Set("Strict-Transport-Security", "max-age=31536000; includeSubDomains")
    }
    next.ServeHTTP(rw, r)
  })
}
The inline <script> in layout.html for CSRF wiring (added in the CSRF advisory) will need either a nonce, a hash in CSP, or external-file extraction. Easiest path: a nonce per request (crypto/rand, base64) injected into both the CSP header and the script's nonce="" attribute.

Fix

Clickjacking

Weakness Enumeration

CWE-1021

Related Identifiers

CVE-2026-47723
GHSA-W7W5-5GCP-38RW

Affected Products

Github.Com/Juev/Nebula-Mesh