{"id":"CVE-2026-18221","title":"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to gain unauthorized access due to improper validation of client-supplied authentication parameters.","summary":"IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to gain unauthorized access due to improper validation of client-supplied authentication parameters.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-287"],"vendor":"ibm","product":"i","affected":["i = 7.3","i = 7.4","i = 7.5","i = 7.6"],"published":"2026-09-04","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:40:12.663","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-18221","references":[{"url":"https://www.ibm.com/support/pages/node/7286186","label":"psirt@us.ibm.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-08T17:21:54.094713Z"},"epss":0.00332,"epssPercentile":0.26614,"ingestedAt":"2026-09-08T15:33:26.963Z","slug":"CVE-2026-18221","body":"## Overview\n\nIBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to gain unauthorized access due to improper validation of client-supplied authentication parameters.\n\n## Affected\n\n- `i = 7.3`\n- `i = 7.4`\n- `i = 7.5`\n- `i = 7.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}