{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.1.2"
              },
              {
                "introduced": "4.2.0"
              },
              {
                "fixed": "4.2.1"
              },
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.3.0-rc1"
              },
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.3.0-rc2"
              },
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.3.0-rc3"
              },
              {
                "introduced": "0"
              },
              {
                "last_affected": "4.3.0-rc4"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "61d6a7434b18612c52d0d6b7565032065262e096"
            },
            {
              "introduced": "a5ce36d0882ae1b4b409a7b68233bf89591a5f95"
            },
            {
              "fixed": "c0aafbcdc221970054869b6c03db77c1dcc63289"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "2a76eeeeee9acdd9aaebc3ec94a40254b933c966"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "aa2b82727f0f1b3edb79f6d31c04b8fd0d718455"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "8966452d1183e94fecc373b9d08c65a0573cbbc6"
            },
            {
              "introduced": "0"
            },
            {
              "last_affected": "8966452d1183e94fecc373b9d08c65a0573cbbc6"
            }
          ],
          "repo": "https://github.com/mattermost/mattermost-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "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.",
  "id": "CVE-2017-18873",
  "modified": "2026-03-13T21:53:35.160486589Z",
  "published": "2020-06-19T18:15:10.600Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://mattermost.com/security-updates/"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}