{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "3.0"
              },
              {
                "fixed": "3.4"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "e46bbf18ebb1aef49319a69dcabf319e2a2c939a"
            },
            {
              "fixed": "974b95b0956e6be5ef43683fbfac951d6460c802"
            }
          ],
          "repo": "https://github.com/zulip/zulip",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "In the topic moving API in Zulip Server 3.x before 3.4, organization administrators were able to move messages to streams in other organizations hosted by the same Zulip installation.",
  "id": "CVE-2021-30487",
  "modified": "2026-08-07T11:31:35.070581406Z",
  "published": "2021-04-15T00:15:13.247Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://blog.zulip.com/2021/04/14/zulip-server-3-4/"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}