CVE-2026-18858

Privileged file information disclosure through SSH

Published Sep 4, 2026 · Updated Sep 4, 2026

Improper privilege management in OpenSSH on IBM's Power operating system 7.5 and 7.6 allows local users to read privileged-file information. IBM has not disclosed the affected OpenSSH function or how an SSH session causes privileged-file information to become accessible. Exploitation requires authenticated local access through SSH, and the reported consequence is limited to unauthorized privileged-file information disclosure.

CVSS severity3.3
Low
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in OpenSSH on IBM's Power operating system 7.5 and 7.6 allows local users to read privileged-file information. IBM has not disclosed the affected OpenSSH function or how an SSH session causes privileged-file information to become accessible. Exploitation requires authenticated local access through SSH, and the reported consequence is limited to unauthorized privileged-file information disclosure.

The record

CVE
CVE-2026-18858
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
IBM
Product
IBM i
Classifications
CWE-267, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=7.5
  2. Affected versionversion=7.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

IBM · IBM iversion=7.5; version=7.6

Published CVSS scores

3.3IBMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-267Privilege Defined With Unsafe Actions
T1005Data from Local System

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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