CVE-2026-20893

SYSTEM privilege escalation via origin validation error

Published Jan 7, 2026 · Updated Jan 7, 2026

Origin validation error in Fujitsu Security Solution AuthConductor Client Basic V2 2.0.25.0 and earlier allows local users to gain SYSTEM privileges. Fujitsu has not disclosed the vulnerable component, the incorrectly trusted origin, or the operation that accepts it. Exploitation requires login access to an affected Windows system and permits arbitrary code execution as SYSTEM or registry modification; affected versions vary with the installed face-authentication option.

CVSS severity8.5
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in Fujitsu Security Solution AuthConductor Client Basic V2 2.0.25.0 and earlier allows local users to gain SYSTEM privileges. Fujitsu has not disclosed the vulnerable component, the incorrectly trusted origin, or the operation that accepts it. Exploitation requires login access to an affected Windows system and permits arbitrary code execution as SYSTEM or registry modification; affected versions vary with the installed face-authentication option.

The record

CVE
CVE-2026-20893
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
Fujitsu Client Computing Limited
Product
Fujitsu Security Solution AuthConductor Client Basic V2
Classifications
CWE-346, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 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=2.0.25.0 and earlier

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Fujitsu Client Computing Limited · Fujitsu Security Solution AuthConductor Client Basic V2version=2.0.25.0 and earlier

Published CVSS scores

8.5JPCERT/CCCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8JPCERT/CCCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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-346Origin Validation Error
T1068Exploitation for Privilege Escalation

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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