CVE-2026-0870

User-to-SYSTEM escalation via inherited browser token

Published Feb 9, 2026 · Updated Feb 9, 2026

Local privilege escalation in GIGABYTE MacroHub 2.3.1 and earlier allows local users to execute arbitrary code as SYSTEM. The browser-launch function starts an external browser without dropping or adjusting MacroHub's NT AUTHORITY\SYSTEM token. A standard Windows user with local access can use the SYSTEM-level browser to spawn a command prompt and take unrestricted control of the host.

CVSS severity8.5
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Local privilege escalation in GIGABYTE MacroHub 2.3.1 and earlier allows local users to execute arbitrary code as SYSTEM. The browser-launch function starts an external browser without dropping or adjusting MacroHub's NT AUTHORITY\SYSTEM token. A standard Windows user with local access can use the SYSTEM-level browser to spawn a command prompt and take unrestricted control of the host.

The record

CVE
CVE-2026-0870
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
GIGA-BYTE Technology Co., Ltd.
Product
MacroHub
Classifications
CWE-250, CAPEC-233, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 9, 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 <=2.3.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

GIGA-BYTE Technology Co., Ltd. · MacroHubversion=0 <=2.3.1

Published CVSS scores

7.8TWCERT/CCCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5TWCERT/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

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-250Execution with Unnecessary Privileges
CAPEC-233Privilege Escalation
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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