CVE-2026-111927

{
  "etk_id": "ETK-2026-1903",
  "cve_id": "CVE-2026-111927",
  "display_id": "CVE-2026-111927",
  "ghsa_id": "GHSA-47cv-h282-xh6p",
  "euvd_id": "EUVD-2026-103294",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Improper hostname validation in Coder workspace proxy",
  "summary": "Coder workspace-proxy hostname handling is affected in versions before 2.29.20 and affected 2.33.x, 2.34.x, and 2.35.x releases before their respective fixes. An attacker controlling a suitably named domain can induce an authenticated user to disclose an application access credential, which can then be used to access that user's workspace applications.",
  "mitigation": "Upgrade Coder to 2.35.4, 2.34.8, 2.33.12, or 2.29.20, as appropriate for your release branch. Until upgraded, restrict user access to untrusted links and review workspace-proxy host configuration for overly permissive naming.",
  "vendor": "coder",
  "product": "coder",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.35.0, < 2.35.4"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "2.35.4"
      ],
      "package_name": "github.com/coder/coder/v2",
      "purl": "pkg:golang/github.com/coder/coder/v2"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.34.0, < 2.34.8"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "2.34.8"
      ],
      "package_name": "github.com/coder/coder/v2",
      "purl": "pkg:golang/github.com/coder/coder/v2"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 2.33.0, < 2.33.12"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "2.33.12"
      ],
      "package_name": "github.com/coder/coder/v2",
      "purl": "pkg:golang/github.com/coder/coder/v2"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 2.29.20"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "2.29.20"
      ],
      "package_name": "github.com/coder/coder/v2",
      "purl": "pkg:golang/github.com/coder/coder/v2"
    }
  ],
  "cwes": [
    522
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N",
  "epss_score": 0.0021,
  "epss_percentile": 0.0995,
  "epss_asof": "2026-10-21",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 25.240244566666668,
  "t0_at": "2026-10-17T18:46:39.347000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-17T20:04:37.652541+00:00",
      "days": 0.05414705487268519,
      "is_lower_bound": false,
      "measured_at": "2026-10-17T18:46:39.347000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-17T18:46:39.347000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-17T18:46:39.347000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-111927"
    }
  }
}