CVE-2026-88804

{
  "etk_id": "ETK-2026-3199",
  "cve_id": "CVE-2026-88804",
  "display_id": "CVE-2026-88804",
  "ghsa_id": "GHSA-992f-xh8r-jg2f",
  "euvd_id": "EUVD-2026-88340",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unauthenticated stored cross-site scripting in Rancher",
  "summary": "Affected Rancher releases allow an unauthenticated network client to change public UI settings through API endpoints intended to be read-only. Modified content can execute in the browser of a user who later opens the Rancher login page, potentially exposing administrator credentials or sessions. The attacker needs network access to the Rancher server; no Rancher account is required.",
  "mitigation": "Upgrade Rancher to v2.15.2, v2.14.6, v2.13.10, v2.12.14, or v2.11.18, as appropriate for your release line. Until upgraded, restrict access to the Rancher endpoint and block non-read requests or method-override parameters to unauthenticated settings endpoints; review public UI settings and rotate administrator credentials and sessions if compromise is suspected.",
  "vendor": "go",
  "product": "go:github.com/rancher/rancher",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=v2.15.0",
        "<v2.15.2"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v2.15.2"
      ],
      "package_name": "github.com/rancher/rancher",
      "purl": "pkg:golang/github.com/rancher/rancher"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=v2.14.0",
        "<v2.14.6"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v2.14.6"
      ],
      "package_name": "github.com/rancher/rancher",
      "purl": "pkg:golang/github.com/rancher/rancher"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=v2.13.0",
        "<v2.13.10"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v2.13.10"
      ],
      "package_name": "github.com/rancher/rancher",
      "purl": "pkg:golang/github.com/rancher/rancher"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=v2.12.0",
        "<v2.12.14"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v2.12.14"
      ],
      "package_name": "github.com/rancher/rancher",
      "purl": "pkg:golang/github.com/rancher/rancher"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=v2.11.0",
        "<v2.11.18"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v2.11.18"
      ],
      "package_name": "github.com/rancher/rancher",
      "purl": "pkg:golang/github.com/rancher/rancher"
    }
  ],
  "cwes": [
    79
  ],
  "cvss_score": 9.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 88.61908921666667,
  "t0_at": "2026-09-28T15:58:34.657000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-10-29T13:50:03+00:00",
      "days": 30.91074471064815,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T15:58:34.657000+00:00",
      "url": "https://github.com/R0gfall/CVE-2026-88804"
    },
    "trigger_signal": {
      "at": "2026-09-28T15:58:34.657000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-28T15:58:34.657000+00:00",
      "url": "https://github.com/rancher/rancher/security/advisories/GHSA-992f-xh8r-jg2f"
    }
  }
}