{"id":"CVE-2021-20789","aliases":["EUVD-2021-8201","GHSA-pvpc-7x96-x9f5"],"status":"published","title":"Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the...","description":"Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to redirect a user to an arbitrary web site and conduct a phishing attack via a specially crafted URL.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00871,"percentile":0.59315,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-601"],"published":"2021-07-28T00:45:32Z","modified":"2026-06-17T03:34:27Z","products":[{"vendor":"groupsession","product":"groupsession"},{"vendor":"groupsession","product":"groupsession_bycloud"},{"vendor":"groupsession","product":"groupsession_zion"},{"vendor":"japan total system co.,ltd.","product":"groupsession"}],"references":[{"url":"https://groupsession.jp/info/info-news/security202107","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://jvn.jp/en/jp/JVN86026700/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20789"},{"url":"https://github.com/advisories/GHSA-pvpc-7x96-x9f5"}],"sources":{"cve":[{"id":"CVE-2021-20789","description":"Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to redirect a user to an arbitrary web site and conduct a phishing attack via a specially crafted URL.","status":"published","published":"2021-07-28T00:45:32Z","modified":"2024-08-03T17:53:22.634Z","updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-8201","description":"Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to redirect a user to an arbitrary web site and conduct a phishing attack via a specially crafted URL.","status":"published","published":"2021-07-28T00:45:32Z","modified":"2024-08-03T17:53:22Z","updated_at":"2026-11-03T03:25:07.874589Z"}],"ghsa":[{"id":"GHSA-pvpc-7x96-x9f5","title":"Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the...","description":"Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to redirect a user to an arbitrary web site and conduct a phishing attack via a specially crafted URL.","status":"published","published":"2022-05-24T19:09:24Z","modified":"2023-01-30T05:00:59Z","cwes":["CWE-601"],"updated_at":"2026-11-02T14:46:19.140142Z"}],"nvd":[{"id":"CVE-2021-20789","description":"Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to redirect a user to an arbitrary web site and conduct a phishing attack via a specially crafted URL.","status":"published","published":"2021-07-30T14:15:14.893Z","modified":"2026-06-17T03:34:27.37Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:06:56.185362Z"}]}}