CVE-2026-18148Network attack vector

Authenticated log forgery via unneutralized Navigator input

Published Aug 12, 2026 · Updated Aug 12, 2026

Log injection in Navigator for IBM operating-system releases 7.3 through 7.6 allows remote authenticated users to inject arbitrary log content. Navigator writes attacker-controlled input into log entries without neutralizing content that can create forged or altered records. A valid Navigator session is required; the reported impact is limited to log integrity, with no data disclosure or service interruption.

CVSS severity4.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in Navigator for IBM operating-system releases 7.3 through 7.6 allows remote authenticated users to inject arbitrary log content. Navigator writes attacker-controlled input into log entries without neutralizing content that can create forged or altered records. A valid Navigator session is required; the reported impact is limited to log integrity, with no data disclosure or service interruption.

The record

CVE
CVE-2026-18148
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
IBM
Product
IBM i
Classifications
CWE-117, T1070
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.3
  2. Affected versionversion=7.4
  3. Affected versionversion=7.5
  4. Affected versionversion=7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM iversion=7.3; version=7.4; version=7.5; version=7.6

Published CVSS scores

4.3IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-117Improper Output Neutralization for Logs
T1070Indicator Removal

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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