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CVE-2026-71403

Estado: AnalizadaMedia (6.1)—

A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings.

This issue affects Rancher: before 2.15.1.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Suse — Rancher

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-71403",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "ssvcData": {
          "id": "CVE-2026-71403",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
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              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-03T00:00:00+00:00"
        }
      }
    ],
    "cvssMetricV31": [
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        "source": "nvd@nist.gov",
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          "repo": "https://github.com/rancher/rancher",
          "vendor": "SUSE",
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              "version": "0",
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  "published": "2026-09-03T15:17:32.180",
  "references": [
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      "url": "https://github.com/rancher/rancher/pull/56616",
      "tags": [
        "Issue Tracking",
        "Patch"
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      "source": "meissner@suse.de"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "meissner@suse.de",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
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  ],
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    {
      "lang": "en",
      "value": "A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings.\n\n\nThis issue affects Rancher: before 2.15.1."
    }
  ],
  "lastModified": "2026-09-18T15:03:02.433",
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}