CVE-2026-121458

{
  "etk_id": "ETK-2026-3369",
  "cve_id": "CVE-2026-121458",
  "display_id": "CVE-2026-121458",
  "ghsa_id": "GHSA-x5cc-8486-8qqx",
  "euvd_id": "EUVD-2026-115812",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Missing object authorization in Instatic AI/MCP content tools",
  "summary": "Instatic releases before 0.0.21 do not consistently enforce per-object access checks for AI/MCP content-reading operations. An authenticated user granted both ai.chat and content.edit.own may be able to view other users' private or unpublished content through that interface.",
  "mitigation": "Upgrade ghcr.io/corebunch/instatic to version 0.0.21 or later. Until upgrades are complete, restrict AI/MCP access and avoid assigning the ai.chat and content.edit.own capability combination to low-privilege users.",
  "vendor": "CoreBunch",
  "product": "Instatic",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 0.0.21"
      ],
      "ecosystem": "other",
      "fixed_versions": [
        "0.0.21"
      ],
      "package_name": "ghcr.io/corebunch/instatic",
      "purl": null
    }
  ],
  "cwes": [
    862
  ],
  "cvss_score": 7.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 19.09543813333333,
  "t0_at": "2026-11-03T12:59:17.285000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-03T12:59:17.285000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-03T12:59:17.285000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-121458"
    }
  }
}