CVE-2026-30478

High

Published: 09 April 2026

Published

09 April 2026

Modified

13 April 2026

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Score 0.0001 2.9th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-30478 is a high-severity Uncontrolled Search Path Element (CWE-427) vulnerability. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Dynamic-link Library Injection (T1055.001); ranked at the 2.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 CM-10 (Software Usage Restrictions) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Dynamic-link Library Injection (T1055.001) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly remediates the DLL injection vulnerability by applying patches or updates to GatewayGeo MapServer version 5.

CM-10 Software Usage Restrictions good match

prevent

Restricts execution of unauthorized software, preventing the crafted executable required to trigger DLL injection and privilege escalation.

SI-3 Malicious Code Protection good match

preventdetect

Deploys anti-malware mechanisms to scan for and block the malicious DLL and crafted executable exploited in this local privilege escalation attack.

MITRE ATT&CK Enterprise TechniquesAI

T1055.001 Dynamic-link Library Injection Stealth

Adversaries may inject dynamic-link libraries (DLLs) into processes in order to evade process-based defenses as well as possibly elevate privileges.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

CVE explicitly describes a DLL Injection vulnerability enabling local privilege escalation via a crafted executable on Windows, directly mapping to T1055.001 (Dynamic-link Library Injection) for code injection and T1068 (Exploitation for Privilege Escalation) as the resulting impact.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

A Dynamic-link Library Injection vulnerability in GatewayGeo MapServer for Windows version 5 allows attackers to escalate privileges via a crafted executable.

Deeper analysisAI

CVE-2026-30478 is a Dynamic-link Library (DLL) Injection vulnerability, classified under CWE-427, affecting GatewayGeo MapServer for Windows version 5. Published on 2026-04-09T18:16:58.847, it carries a CVSS v3.1 base score of 8.8 (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H). The issue enables attackers to escalate privileges by leveraging a crafted executable.

A local attacker with low privileges (PR:L) can exploit this vulnerability with low attack complexity (AC:L) and no user interaction (UI:N). Exploitation requires local access (AV:L) but results in a high scope change (S:C), yielding high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H), typically allowing escalation to higher privileges.

Mitigation guidance and additional details are available in advisories from the vendor site at https://ms4w.com and a research repository at https://github.com/penjaminTester/Research/tree/main/CVE-2026-30478.