Unsanitized events sent over Websocket to regular users in a High Availability environment

{
  "id": "61a8e1bb85f137394e4b0efa8de77ff16d2a03d11909a02120c2cbc20461c497",
  "url": "https://osv.dev/vulnerability/CVE-2023-1775",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Unsanitized events sent over Websocket to regular users in a High Availability environment",
    "summary": "When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.",
    "evidence": "osv:CVE-2023-1775",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-1775",
      "aliases": [
        "BIT-mattermost-2023-1775",
        "CVE-2023-1775",
        "GHSA-8jhh-3jf2-pfwr"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mattermost/mattermost",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5a8ebc95d0cbf61d974430d4c03c3ffef36d4543"
                },
                {
                  "introduced": "63149c4869898f8c1d3a94ea728370ec4a07575f"
                },
                {
                  "last_affected": "63149c4869898f8c1d3a94ea728370ec4a07575f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7.1.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mattermost:mattermost_server:7.7.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "7.7.1"
                      },
                      {
                        "last_affected": "7.7.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "7.7.1",
            "v7.7.1",
            "v7.1.5",
            "v7.1.4",
            "v7.1.3",
            "v7.1.2",
            "v7.1.1",
            "v7.1.0",
            "cloud-2022-06-29-1",
            "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-2023-1775.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.116937750Z",
      "provider": "osv",
      "references": [
        "https://mattermost.com/security-updates/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1775.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-1775"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "Mattermost",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "3.3.0"
                  },
                  {
                    "last_affected": "7.7.1"
                  },
                  {
                    "introduced": "3.3.0"
                  },
                  {
                    "last_affected": "7.1.5"
                  },
                  {
                    "introduced": "3.3.0"
                  },
                  {
                    "fixed": "7.8.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1775.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-1775",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510070,
  "published_at": "2023-03-31T11:26:21.64+00:00"
}