CVE-2026-16892

IBM i is Affected By An Improper Authentication Vulnerability in Network Authentication Service []

Published Sep 4, 2026 CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Description

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to bypass security restrictions due to improper authentication during service-name matching.

Analysis

Technical impact

The vulnerability arises from improper authentication during service‑name matching in IBM i's Network Authentication Service. A remote attacker who can authenticate to the system may bypass intended security restrictions, potentially gaining elevated access or manipulating protected resources. This flaw is classified as CWE‑287, underscoring its foundation in flawed authentication logic.

Affected Systems

Affected systems include IBM i releases 7.3, 7.4, 7.5, and 7.6. The specific product is IBM i, and the impact covers all versions listed. Each of these legacy releases is vulnerable until the corresponding IBM PTF is applied.

Risk and Exploitability

The CVSS score of 5.4 indicates moderate severity, though the EPSS score is not available, making it difficult to assess current exploitation likelihood. The vulnerability is not yet listed in CISA's KEV catalog. Exploitation requires the attacker to possess valid credentials, but once authenticated the attacker can exploit the flaw to circumvent access controls. Prioritizing patch deployment is therefore critical.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

IBM

affected

Version	Status	Constraints
`7.6`	affected	—
`7.5`	affected	—
`7.4`	affected	—
`7.3`	affected	—

Configuration 1 [-]

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:::::::*

No data.

Vendor Product Versions

Ibm

Version	Status	Scheme	Platform
`7.6`	affected	generic	—
`7.5`	affected	generic	—
`7.4`	affected	generic	—
`7.3`	affected	generic	—

Remediation

Vendor Solution

IBM i Release5770-SS1 PTF Number(s)PTF Download Link(s)7.6SJ11089 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11089 7.5SJ11090 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11090 7.4SJ11091 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11091 7.3SJ11092 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ11092 IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.

OpenCVE Recommended Actions

Download and install the IBM i PTF that applies to your release (SJ11089 for 7.6, SJ11090 for 7.5, SJ11091 for 7.4, or SJ11092 for 7.3).
Restart the Network Authentication Service or reboot the system to apply the new authentication logic.
If your environment runs an unsupported IBM i version, plan an upgrade to a supported release that includes the fix as part of IBM's supported path.

Generated by OpenCVE AI on September 4, 2026 at 17:58 UTC.

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.356% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://www.ibm.com/support/pages/node/7285843

History

Sep 8, 2026 5:45 PM Affected versions updated View changes

Type	Values Removed	Values Added
CPEs		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:::::::*

Sep 4, 2026 6:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 4, 2026 4:45 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to bypass security restrictions due to improper authentication during service-name matching.
Title		IBM i is Affected By An Improper Authentication Vulnerability in Network Authentication Service []
First Time appeared		Ibm Ibm i
Weaknesses		CWE-287
CPEs		cpe:2.3:a:ibm:i:7.3.0:::::::* cpe:2.3:a:ibm:i:7.3:::::::* cpe:2.3:a:ibm:i:7.4.0:::::::* cpe:2.3:a:ibm:i:7.4:::::::* cpe:2.3:a:ibm:i:7.5.0:::::::* cpe:2.3:a:ibm:i:7.5:::::::* cpe:2.3:a:ibm:i:7.6.0:::::::* cpe:2.3:a:ibm:i:7.6:::::::*
Vendors & Products		Ibm Ibm i
References		https://www.ibm.com/support/pages/node/7285843
Metrics		cvssV3_1 `{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}`