CVE-2026-18318: IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote attacker to perform brute-force attacks to obtain credential

Q: How do I fix CVE-2026-18318?

i: upgrade to newer than 7.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-18318 being exploited?

CVE-2026-18318 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-18318 affect?

CVE-2026-18318 affects i. Severity is medium (CVSS 5.3). IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote attacker to perform brute-force attacks to obtain credentials due to improper authentication.

Q: How urgent is CVE-2026-18318?

Priority 29/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-18318 is a medium-severity flaw (CVSS 5.3) affecting i. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote attacker to perform brute-force attacks to obtain credentials due to improper authentication.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-307
Published	2026-10-13
Last modified	2026-10-14

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-13 00:17 UTCPublished CVE record published
2026-10-14 23:49 UTCUpdated Record last modified

ibm i UPGRADE

Affected: >= 7.3 and <= 7.6

Fixed in: newer than 7.6

Safe to downgrade to: a release before 7.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-18318?

i: upgrade to newer than 7.6. Exact commands for each OS are on this page.

Is CVE-2026-18318 being exploited?

CVE-2026-18318 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-18318 affect?

CVE-2026-18318 affects i. Severity is medium (CVSS 5.3). IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote attacker to perform brute-force attacks to obtain credentials due to improper authentication.

How urgent is CVE-2026-18318?

Priority 29/100. Remotely exploitable, no login, no user action

Related CVEs

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CVE-2026-9072 HIGH 8.1 UPGRADE IBM WebSphere Application Server and IBM WebSphere Application Server Liberty - when using Intelligent Managem
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References

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