CVE-2026-18221

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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.ibm.com/support/pages/node/7286186	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:ibm:i:7.3:::::::*
	cpe:2.3:o:ibm:i:7.4:::::::*
	cpe:2.3:o:ibm:i:7.5:::::::*
	cpe:2.3:o:ibm:i:7.6:::::::*

History

No history.

Information

Published : 2026-09-04 17:16

Updated : 2026-09-08 19:40

NVD link : CVE-2026-18221

Mitre link : CVE-2026-18221

CVE.ORG link : CVE-2026-18221

JSON object : View

Products Affected

ibm

i

CWE

CWE-287

Improper Authentication

{"id": "CVE-2026-18221", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18221", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-08T17:21:54.094713Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "psirt@us.ibm.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "psirt@us.ibm.com", "affectedData": [{"cpes": ["cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*"], "vendor": "IBM", "product": "i", "versions": [{"status": "affected", "version": "7.6"}, {"status": "affected", "version": "7.5"}, {"status": "affected", "version": "7.4"}, {"status": "affected", "version": "7.3"}]}]}], "published": "2026-09-04T17:16:56.150", "references": [{"url": "https://www.ibm.com/support/pages/node/7286186", "tags": ["Patch", "Vendor Advisory"], "source": "psirt@us.ibm.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "psirt@us.ibm.com", "description": [{"lang": "en", "value": "CWE-287"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-08T19:40:12.663", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:ibm:i:7.3:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9A49E8C5-7967-42AE-A787-C533D24A63D7"}, {"criteria": "cpe:2.3:o:ibm:i:7.4:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "92D03306-B6C9-403E-99A2-CE9D8DC3B482"}, {"criteria": "cpe:2.3:o:ibm:i:7.5:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F7CCB5BF-08EF-472F-A663-5DE270234F10"}, {"criteria": "cpe:2.3:o:ibm:i:7.6:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AFFF96C2-7E0F-4DF9-AF51-3EE357D51095"}], "operator": "OR"}]}], "sourceIdentifier": "psirt@us.ibm.com"}