{"id":"CVE-2026-85181","summary":"CAT through 3.1.0 Session Cookie Forgery via Unkeyed hashCode Checksum","details":"CAT uses Java String.hashCode as the sole integrity check for session cookies without server-side keying, allowing attackers to forge valid checksums offline. Attackers can set the x-forwarded-for header to bypass IP binding validation and create admin sessions with full configuration access.","modified":"2026-09-05T03:48:28.990656209Z","published":"2026-09-03T14:12:19.751Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-565"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85181.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85181.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85181"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/cat-through-3.1.0-session-cookie-forgery-via-unkeyed-hashcode-checksum"},{"type":"REPORT","url":"https://github.com/dianping/cat/issues/2384"},{"type":"PACKAGE","url":"https://github.com/dianping/cat"},{"type":"ARTICLE","url":"https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/system/page/login/service/TokenBuilder.java"},{"type":"ARTICLE","url":"https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/util/HttpUtils.java"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dianping/cat","events":[{"introduced":"0"},{"last_affected":"3152e71443eea268773aec1f492899bc0abd4d07"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"3.1.0"}],"source":"AFFECTED_FIELD"}}],"versions":["3.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85181.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}