Security advisory

{
  "id": "a8f5b0f0f65be09df91abe981c253dbaeefe24c4f5214b93bd3cc88bef9f7a86",
  "url": "https://osv.dev/vulnerability/CVE-2017-18907",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-18907",
    "summary": "An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2. XSS could occur via a channel header.",
    "evidence": "osv:CVE-2017-18907",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2017-18907",
      "aliases": [
        "CVE-2017-18907",
        "GHSA-42x9-rr3c-gr59",
        "GO-2026-4459"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mattermost/mattermost",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6a2754376c8c8270be5e11e3fdab589659d0cc8d"
                },
                {
                  "introduced": "8b83e9d4279718c8f9797c6a9c081245231cbba0"
                },
                {
                  "fixed": "f06c5bef4d78966c60b153bbec6eea4ec0be9e68"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.9.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.10.0"
                      },
                      {
                        "fixed": "3.10.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.10.1",
            "v3.9.1-rc2",
            "v3.9.1",
            "v3.9.1-rc1",
            "v3.10.0",
            "v3.9.0",
            "v0.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18907.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:41.968123631Z",
      "provider": "osv",
      "references": [
        "https://mattermost.com/security-updates/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2017-18907",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 435251,
  "published_at": "2020-06-19T20:15:12.197+00:00"
}