What is the CVSS score of CVE-2026-16189?

CVE-2026-16189 has a CVSS 3.1 base score of 4.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.2%.

Is there a patch available for CVE-2026-16189?

Yes, a patch is available for CVE-2026-16189. Update the affected software to the latest version immediately.

Websphere Application Server CVE-2026-16189

EUVD-2026-77800 MEDIUM

Improper Output Neutralization for Logs (CWE-117)

2026-09-14 ibm

GHSA-w42g-8v89-j7g6

IBM Code Injection Websphere Application Server

4.8

CVSS 3.1 · Vendor: ibm

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Vulnerability Assessment

Weakness

CWE

CWE-117

OWASP Top 10:2025

A09:2025 - Security Logging & Alerting Failures

ASVS 5.0

V16 - Security Logging and Error Handling Log output neutralization

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

Log injection in IBM WebSphere Application Server 8.5 and 9.0 lets a remote attacker forge entries in the server's administrative log, undermining the integrity of audit records used for monitoring and forensics. The flaw is rated CVSS 4.8 (AV:N/AC:H/PR:N/UI:N) and stems from improper neutralization of log output (CWE-117). IBM has published a vendor fix, and no public exploit code or CISA KEV listing was identified at time of analysis.

Affected VersionsENISA

WebSphere Application Server 8.5

WebSphere Application Server 9.0

Affected Packages

euvd websphere_application_server no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (ibm) PRIMARY 4.8 MEDIUM

AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Primary rating from Vendor (ibm) · only source for this CVE.

CVSS VectorVendor: ibm

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

DescriptionCVE.org

IBM WebSphere Application Server 9.0, and 8.5 could allow a remote attacker to inject forged log entries into the server's administrative log.

Threat Intelligence Overview

EPSS Score

0.2%

Top 88% exploitable

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +24

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.