CVE-2026-30478Public exploit

Local SYSTEM code execution via writable plugin configuration

Published Apr 9, 2026 · Updated Apr 9, 2026

DLL injection in GatewayGeo MapServer for Windows 5 allows local users to execute arbitrary code as NT AUTHORITY\SYSTEM. The default C:\ms4w\ms4w.conf file is writable by all users, and the SYSTEM-run service trusts its MAPS and PLUGINS entries to load a map file and DLL from an attacker-controlled share. A non-administrative user with local host access can alter the configuration and invoke mapserv.exe through localhost, causing the service to load the DLL with SYSTEM privileges.

CVSS severity8.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL injection in GatewayGeo MapServer for Windows 5 allows local users to execute arbitrary code as NT AUTHORITY\SYSTEM. The default C:\ms4w\ms4w.conf file is writable by all users, and the SYSTEM-run service trusts its MAPS and PLUGINS entries to load a map file and DLL from an attacker-controlled share. A non-administrative user with local host access can alter the configuration and invoke mapserv.exe through localhost, causing the service to load the DLL with SYSTEM privileges.

The record

CVE
CVE-2026-30478
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-427, T1574.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-427Uncontrolled Search Path Element
T1574.002Hijack Execution Flow: DLL Side-Loading

Public exploit references

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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