CVE-2026-18221 IBM i is Affected By Improper Authorization and Authentication Vulnerabilities in DDM / DRDA [, ]
Remote attackers can gain unauthorized access to IBM i systems due to improper validation of authentication parameters in DDM/DRDA services.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18221?
CVE-2026-18221 is a high-severity authentication bypass vulnerability in Ibm I, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-18221?
It affects 1 product.
Products include Ibm I.
How do I fix CVE-2026-18221?
No fix has been published for CVE-2026-18221 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-18221 being exploited?
There is no known exploitation of CVE-2026-18221 in the wild and no public exploit code.
Other vulnerabilities in Ibm I
- CVE-2026-96119 IBM i is Affected By An Improper Control of Code Generation Vulnerability in HTTP Server Administration GUI
- CVE-2026-16860 IBM i is Affected By Remote Code Execution Vulnerability []
- CVE-2026-17083 IBM i is Affected By Multiple Vulnerabilities in the Debug Server
- CVE-2026-17218 IBM i is Affected By Remote Code Execution Vulnerability in Line Printer Daemon []
- CVE-2026-17276 IBM i is Affected By Multiple Vulnerabilities in Navigator for i
Sources
Also known as GHSA-7wjh-qq66-9589.