CVE-2026-105863

{
  "etk_id": "ETK-2026-827",
  "cve_id": "CVE-2026-105863",
  "display_id": "CVE-2026-105863",
  "ghsa_id": "GHSA-66wr-7vmr-p5jq",
  "euvd_id": "EUVD-2026-93509",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Authentication token claim injection in Payload",
  "summary": "Affected Payload deployments can include unintended custom-field values in authentication tokens issued during login. An attacker may obtain a token with improperly populated claims when the deployment maps a custom field to a reserved authentication claim name; this requires both that configuration and an affected release.",
  "mitigation": "Upgrade the npm payload package to 3.90.0 or later, or to 4.0.0-canary.34 or later on the canary line. Review custom field mappings and remove mappings to reserved authentication claim names.",
  "vendor": "payloadcms",
  "product": "payload",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0.0, < 3.90.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "3.90.0"
      ],
      "package_name": "payload",
      "purl": "pkg:npm/payload"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.0-canary.0, < 4.0.0-canary.34"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "4.0.0-canary.34"
      ],
      "package_name": "payload",
      "purl": "pkg:npm/payload"
    }
  ],
  "cwes": [
    290
  ],
  "cvss_score": 9.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0038,
  "epss_percentile": 0.3014,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 20.85219455,
  "t0_at": "2026-10-06T16:39:44.912000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-07T01:06:19.528558+00:00",
      "days": 0.3517895434953704,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T16:39:44.912000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-06T16:39:44.912000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-06T16:39:44.912000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-105863"
    }
  }
}