Unauthorized Channel Subscription Creation in Mattermost Confluence Plugin

{
  "id": "fb71d8dd189245dd3f6a47601047271ee1704a8145bc72224cc3c67ec76b22bf",
  "url": "https://osv.dev/vulnerability/CVE-2025-8285",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Unauthorized Channel Subscription Creation in Mattermost Confluence Plugin",
    "summary": "Mattermost Confluence Plugin version <1.5.0 fails to check the access of the user to the channel which allows attackers to create channel subscription without proper access to the channel via API call to the create channel subscription endpoint.",
    "evidence": "osv:CVE-2025-8285",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-8285",
      "aliases": [
        "CVE-2025-8285",
        "GHSA-qjrx-j8wm-xf83",
        "GO-2025-3868"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mattermost/mattermost-plugin-confluence",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "eccd0fdb6730a5a2e5a8e3f9636b27122f024e47"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.5.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:confluence:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.5.0-rc2",
            "v1.5.0-rc1",
            "v1.4.0-rc1",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0",
            "v1.1.0-rc1",
            "v1.0.0",
            "v0.1.0-rc2",
            "v0.1.0-rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-8285.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.611481112Z",
      "provider": "osv",
      "references": [
        "https://github.com/mattermost/mattermost-plugin-confluence/",
        "https://mattermost.com/security-updates",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8285.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-8285"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "Mattermost",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8285.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-8285",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519402,
  "published_at": "2025-08-11T18:57:07.701+00:00"
}