Security advisory

{
  "id": "bee4fb2c46b051c6978a1fe421a6493953a34d537d21ccd013af5cd094112407",
  "url": "https://osv.dev/vulnerability/CVE-2017-18873",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-18873",
    "summary": "An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to cause a denial of service (channel invisibility) via a misformatted post.",
    "evidence": "osv:CVE-2017-18873",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2017-18873",
      "aliases": [
        "CVE-2017-18873",
        "GHSA-x6mw-hf2j-vqpc",
        "GO-2026-4282"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mattermost/mattermost",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "61d6a7434b18612c52d0d6b7565032065262e096"
                },
                {
                  "introduced": "a5ce36d0882ae1b4b409a7b68233bf89591a5f95"
                },
                {
                  "fixed": "c0aafbcdc221970054869b6c03db77c1dcc63289"
                },
                {
                  "introduced": "2a76eeeeee9acdd9aaebc3ec94a40254b933c966"
                },
                {
                  "last_affected": "8966452d1183e94fecc373b9d08c65a0573cbbc6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2.0"
                      },
                      {
                        "fixed": "4.2.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.3.0-rc1"
                      },
                      {
                        "last_affected": "4.3.0-rc1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc2:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.3.0-rc2"
                      },
                      {
                        "last_affected": "4.3.0-rc2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc3:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.3.0-rc3"
                      },
                      {
                        "last_affected": "4.3.0-rc3"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:4.3.0:rc4:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.3.0-rc4"
                      },
                      {
                        "last_affected": "4.3.0-rc4"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.3.0-rc1",
            "4.3.0-rc2",
            "4.3.0-rc3",
            "v4.3.0-rc4",
            "v4.3.0-rc3",
            "v4.3.0",
            "v4.3.0-rc2",
            "v4.3.0-rc1",
            "v4.1.1-rc1",
            "v4.1.1",
            "v4.2.0-rc4",
            "v4.2.0",
            "v4.1.0",
            "v0.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18873.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:30.753176358Z",
      "provider": "osv",
      "references": [
        "https://mattermost.com/security-updates/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2017-18873",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 432653,
  "published_at": "2020-06-19T18:15:10.6+00:00"
}