CVE-2026-18221
CRITICALCVSS 9.8/10EPSS 0.32%
Last modified
CVE-2026-18221 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ibm | I | 7.3 |
| Ibm | I | 7.4 |
| Ibm | I | 7.5 |
| Ibm | I | 7.6 |
References
- https://www.ibm.com/support/pages/node/7286186Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is 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.
How severe is CVE-2026-18221?
CVE-2026-18221 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.
How do I fix CVE-2026-18221?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2026-18221?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST