{"id":"CVE-2025-66284","title":"Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION prior to ver5.7.1","summary":"Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION prior to ver5.7.1. A logged-in user can prepare a malicious page or URL, and …","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-79"],"vendor":"groupsession","product":"groupsession","affected":["groupsession < 5.7.1"],"patched":["groupsession 5.7.1"],"published":"2025-12-12","updated":"2026-10-07","sourceUpdated":"2026-10-07T20:10:01.970","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-66284","references":[{"url":"https://groupsession.jp/info/info-news/security20251208","label":"vultures@jpcert.or.jp"},{"url":"https://jvn.jp/en/jp/JVN19940619/","label":"vultures@jpcert.or.jp"}],"tags":["nvd"],"epss":0.00173,"epssPercentile":0.06097,"ingestedAt":"2026-10-07T20:46:46.892Z","slug":"CVE-2025-66284","body":"## Overview\n\nStored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION prior to ver5.7.1. A logged-in user can prepare a malicious page or URL, and an arbitrary script may be executed on the web browser when another user accesses it.\n\n## Affected\n\n- `groupsession < 5.7.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `groupsession 5.7.1`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}