Denial of Service via multiple identical User IDs in /api/v4/users/ids

{
  "id": "e0f5705c7950a295de256ebb6d81a9e4c68e45713f0ae1c373be2191779a0343",
  "url": "https://osv.dev/vulnerability/CVE-2023-5333",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Denial of Service via multiple identical User IDs in /api/v4/users/ids",
    "summary": "Mattermost fails to deduplicate input IDs allowing a simple user to cause the application to consume excessive resources and possibly crash by sending a specially crafted request to /api/v4/users/ids with multiple identical IDs.",
    "evidence": "osv:CVE-2023-5333",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-5333",
      "aliases": [
        "BIT-mattermost-2023-5333",
        "CVE-2023-5333"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mattermost/mattermost",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "58a74d76295680a5bb684f795e21970ab53fee1d"
                },
                {
                  "introduced": "90f502dc2dc80ee25cfb7d7bc3e743b53564a5a7"
                },
                {
                  "fixed": "ce6e98b51cbf6fb688b0a453b05634ddd0d00085"
                },
                {
                  "introduced": "096c9ea12a2144f832e330e9a0f4d3862ca20b9f"
                },
                {
                  "fixed": "9d2d03594f2ebca50ae47161ab9a22059f751fb8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7.8.11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.0.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.1.0"
                      },
                      {
                        "fixed": "8.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v8.1.2-rc1",
            "v8.0.2-rc3",
            "v8.0.2",
            "@mattermost/types@8.0.0",
            "@mattermost/client@8.0.0",
            "v7.8.10-rc5",
            "v7.8.10",
            "v8.1.1-rc2",
            "v8.1.1",
            "@mattermost/types@8.1.1",
            "@mattermost/client@8.1.1",
            "v7.8.10-rc4",
            "v8.0.2-rc2",
            "v8.1.1-rc1",
            "v7.8.10-rc3",
            "v8.1.0-rc2",
            "v8.1.0",
            "v7.8.9",
            "v8.0.1",
            "v8.0.0",
            "v7.8.8",
            "v7.8.7",
            "v7.8.6",
            "v7.8.5",
            "v7.8.4",
            "v7.8.3",
            "v7.8.2",
            "v7.8.1",
            "v7.8.0",
            "cloud-2023-01-26-1",
            "cloud-2022-11-24-1",
            "cloud-2022-11-11-1",
            "cloud-2022-10-06-1",
            "cloud-2022-09-08-1",
            "cloud-2022-08-10-1",
            "cloud-2022-07-20-1",
            "v5.2.0-rc2",
            "v5.2.0-rc1",
            "v5.1.0-rc1",
            "v5.0.0-rc1",
            "v4.10.0-rc1",
            "v4.9.0-rc1",
            "v4.8.0-rc1",
            "v4.7.0-rc1",
            "v4.6.0-rc2",
            "v4.6.0-rc1",
            "v4.5.0-rc1",
            "v4.4.0-rc1",
            "v4.3.0-rc1",
            "v4.2.0-rc1",
            "v0.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-5333.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.830232461Z",
      "provider": "osv",
      "references": [
        "https://mattermost.com/security-updates",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/5xxx/CVE-2023-5333.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-5333"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "Mattermost",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "7.8.10"
                  },
                  {
                    "last_affected": "8.0.2"
                  },
                  {
                    "last_affected": "8.1.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/5xxx/CVE-2023-5333.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-5333",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521827,
  "published_at": "2023-10-09T10:41:36.597+00:00"
}