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CVE-2026-15754

Estado: AnalizadaMedia (4.2)—

Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate that each target channel still belongs to the requesting admin's team, which allows an authenticated team administrator to remove ABAC (attribute-based access control) policy assignments from channels outside their team via the policy unassign API after a channel has been moved to another team.. Mattermost Advisory ID: MMSA-2026-00718

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)

Mattermost — Mattermost Server

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-15754",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2026-15754",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-17T14:50:36.703223Z"
        }
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    ],
    "cvssMetricV31": [
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          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 0.5
      }
    ]
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      "source": "responsibledisclosure@mattermost.com",
      "affectedData": [
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          "product": "Mattermost",
          "versions": [
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              "status": "affected",
              "version": "11.7.0",
              "versionType": "semver",
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            },
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              "status": "affected",
              "version": "11.8.0",
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              "version": "11.7.7"
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              "version": "11.8.4"
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  "published": "2026-08-17T15:16:53.743",
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      "tags": [
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  "weaknesses": [
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      "source": "responsibledisclosure@mattermost.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate that each target channel still belongs to the requesting admin's team, which allows an authenticated team administrator to remove ABAC (attribute-based access control) policy assignments from channels outside their team via the policy unassign API after a channel has been moved to another team.. Mattermost Advisory ID: MMSA-2026-00718"
    }
  ],
  "lastModified": "2026-08-18T20:24:58.563",
  "configurations": [
    {
      "nodes": [
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          "negate": false,
          "cpeMatch": [
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}