{"id":"CVE-2026-85181","title":"CAT uses Java String.hashCode as the sole integrity check for session cookies without server-side keying, allowing attackers to forge valid checksums offline","summary":"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 a…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-565"],"published":"2026-09-03","updated":"2026-09-23","sourceUpdated":"2026-09-23T17:17:45.670","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85181","references":[{"url":"https://github.com/dianping/cat","label":"disclosure@vulncheck.com"},{"url":"https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/system/page/login/service/TokenBuilder.java","label":"disclosure@vulncheck.com"},{"url":"https://github.com/dianping/cat/blob/3.1.0/cat-home/src/main/java/com/dianping/cat/util/HttpUtils.java","label":"disclosure@vulncheck.com"},{"url":"https://github.com/dianping/cat/issues/2384","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/cat-through-3.1.0-session-cookie-forgery-via-unkeyed-hashcode-checksum","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00382,"epssPercentile":0.32071,"ingestedAt":"2026-09-23T17:28:14.822Z","slug":"CVE-2026-85181","body":"## Overview\n\nCAT 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}