CVE-2026-16791Hinoki check available

Arbitrary file overwrite by local users

Published Aug 4, 2026 · Updated Aug 4, 2026

Insecure temporary file creation in Lenovo XClarity Essentials OneCLI 5.5.0 and earlier allows local users to overwrite or truncate files. Lenovo has not disclosed the temporary-file names, creation flags, race behavior, or whether symbolic-link handling is involved. A low-privileged local account and elevated OneCLI execution are required; the documented consequence is file corruption, not file disclosure.

CVSS severity1.0
Low
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Insecure temporary file creation in Lenovo XClarity Essentials OneCLI 5.5.0 and earlier allows local users to overwrite or truncate files. Lenovo has not disclosed the temporary-file names, creation flags, race behavior, or whether symbolic-link handling is involved. A low-privileged local account and elevated OneCLI execution are required; the documented consequence is file corruption, not file disclosure.

The record

CVE
CVE-2026-16791
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
Lenovo
Product
XClarity Essentials OneCLI
Classifications
CWE-377, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 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=0 <5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Lenovo · XClarity Essentials OneCLIversion=0 <5.6

Published CVSS scores

1.0Lenovo Group Ltd.CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
3.9Lenovo Group Ltd.CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L

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 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-377Insecure Temporary File
T1565.001Stored Data Manipulation

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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