{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "10.11.0"
              },
              {
                "fixed": "10.11.14"
              },
              {
                "introduced": "11.5.0"
              },
              {
                "fixed": "11.5.2"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
            },
            {
              "fixed": "b21ef302025ee100f04f358c16301dc75fea91d9"
            },
            {
              "introduced": "9f2616376582893035a7e3cb38b0fab648bba4e8"
            },
            {
              "fixed": "cc4ef6863ee114bc96be4e34478ec2f0db3eac4e"
            }
          ],
          "repo": "https://github.com/mattermost/mattermost",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Mattermost",
    "cwe_ids": [
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4286.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "11.5.0"
          },
          {
            "last_affected": "11.5.1"
          },
          {
            "introduced": "10.11.0"
          },
          {
            "last_affected": "10.11.13"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Mattermost versions 11.5.x \u003c= 11.5.1, 10.11.x \u003c= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with only {{Manage Playbook Configurations}} permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID: MMSA-2025-00552",
  "id": "CVE-2026-4286",
  "modified": "2026-07-15T01:49:10.594002192Z",
  "published": "2026-05-18T08:07:06.829Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4286.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://mattermost.com/security-updates"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4286"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Playbooks Plugin fails to validate team transfers, allowing unauthorized removal of member access via playbook update"
}