{"id":"CVE-2026-47723","aliases":["GHSA-w7w5-5gcp-38rw"],"title":"nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)","summary":"nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)","severity":"high","cwe":["CWE-1021"],"vendor":"juev","product":"github.com/juev/nebula-mesh","ecosystem":"go","affected":["github.com/juev/nebula-mesh <= 0.3.0"],"patched":["github.com/juev/nebula-mesh 0.3.1"],"published":"2026-06-08","updated":"2026-06-08","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-w7w5-5gcp-38rw","references":[{"url":"https://github.com/juev/nebula-mesh/security/advisories/GHSA-w7w5-5gcp-38rw"},{"url":"https://github.com/forgekeep/nebula-mesh/commit/b45fda5476c41ffcff1ca23058aef0fb851359c1"},{"url":"https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.1"},{"url":"https://github.com/advisories/GHSA-w7w5-5gcp-38rw"}],"tags":["ghsa","go"],"ingestedAt":"2026-07-07T15:41:59.827Z","epss":0.00526,"epssPercentile":0.43369,"slug":"CVE-2026-47723","body":"## Overview\n\nNone 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.\n\n## Impact\nThe 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.\n\n## Affected\nAll released versions up to v0.3.0.\n\n## Suggested fix\nA single response-header middleware mounted at the chi router root in both `/ui/*` and `/api/*` paths:\n\n```go\nfunc securityHeadersMiddleware(next http.Handler) http.Handler {\n    return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {\n        h := rw.Header()\n        h.Set(\"Content-Security-Policy\",\n            \"default-src 'self'; frame-ancestors 'none'; base-uri 'none'; form-action 'self'\")\n        h.Set(\"X-Content-Type-Options\", \"nosniff\")\n        h.Set(\"Referrer-Policy\", \"same-origin\")\n        h.Set(\"X-Frame-Options\", \"DENY\")  // belt-and-braces; CSP frame-ancestors is the modern path\n        if r.TLS != nil {\n            h.Set(\"Strict-Transport-Security\", \"max-age=31536000; includeSubDomains\")\n        }\n        next.ServeHTTP(rw, r)\n    })\n}\n```\n\nThe 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.\n\n## Affected packages\n\n- `github.com/juev/nebula-mesh <= 0.3.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/juev/nebula-mesh 0.3.1`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}