{"id":"CVE-2021-30479","aliases":["EUVD-2021-17402","GHSA-r3hv-m3j5-mrfp"],"status":"published","title":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the...","description":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00862,"percentile":0.59052,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-269","CWE-732"],"published":"2021-04-14T23:48:38Z","modified":"2026-10-24T10:30:42Z","products":[{"vendor":"zulip","product":"zulip_server"}],"references":[{"url":"https://blog.zulip.com/2021/04/14/zulip-server-3-4/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30479"},{"url":"https://github.com/advisories/GHSA-r3hv-m3j5-mrfp"}],"sources":{"cve":[{"id":"CVE-2021-30479","description":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.","status":"published","published":"2021-04-14T23:48:38Z","modified":"2024-08-03T22:32:41.094Z","updated_at":"2026-11-02T14:33:02.20241Z"}],"euvd":[{"id":"EUVD-2021-17402","description":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.","status":"published","published":"2021-04-14T23:48:38Z","modified":"2024-08-03T22:32:41Z","updated_at":"2026-11-03T03:24:41.906207Z"}],"ghsa":[{"id":"GHSA-r3hv-m3j5-mrfp","title":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the...","description":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.","status":"published","published":"2022-05-24T17:47:43Z","modified":"2023-01-27T05:02:45Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-732"],"updated_at":"2026-11-02T14:42:05.930236Z"}],"nvd":[{"id":"CVE-2021-30479","description":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.","status":"published","published":"2021-04-15T00:15:13.17Z","modified":"2026-06-17T03:50:19.083Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:06:52.03307Z"}],"osv":[{"id":"CVE-2021-30479","description":"An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.","status":"published","published":"2021-04-15T00:15:13.17Z","modified":"2026-10-24T10:30:42.514626518Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:19.483607Z"}]}}