CVE-2026-4312

Critical

Published: 17 March 2026

Published

17 March 2026

Modified

17 March 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0022 44.1th percentile

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

Summary

CVE-2026-4312 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Org (inferred from references). Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 44.1th 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 AC-14 (Permitted Actions Without Identification or Authentication) and AC-2 (Account Management).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) 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

AC-14 Permitted Actions Without Identification or Authentication good match

prevent

Directly requires organizations to limit and document permitted actions without identification or authentication, preventing unauthenticated access to APIs for creating administrative accounts.

AC-3 Access Enforcement good match

prevent

Enforces approved authorizations for logical access to system resources, ensuring authentication is required for sensitive API endpoints exploited in this vulnerability.

AC-2 Account Management good match

prevent

Manages account creation processes to restrict administrative account provisioning to authorized entities only, blocking unauthorized admin account creation via unauthenticated APIs.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1136 Create Account Persistence

Adversaries may create an account to maintain access to victim systems.

attack.mitre.org →

Why these techniques?

Missing authentication in public-facing APIs enables exploitation of public-facing application (T1190) and creation of administrative accounts (T1136).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

GCB/FCB Audit Software developed by DrangSoft has a Missing Authentication vulnerability, allowing unauthenticated remote attackers to directly access certain APIs to create a new administrative account.

Deeper analysisAI

CVE-2026-4312 is a Missing Authentication vulnerability (CWE-306) affecting GCB/FCB Audit Software developed by DrangSoft. Published on 2026-03-17, it carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity due to its network accessibility, low complexity, and lack of prerequisites. The flaw enables unauthenticated remote attackers to directly access certain APIs without authentication.

Unauthenticated attackers with network access can exploit this vulnerability remotely and with low effort, requiring no privileges, user interaction, or special conditions. Successful exploitation allows attackers to create a new administrative account, potentially granting full control over the affected software, with high impacts on confidentiality, integrity, and availability.

Mitigation details are provided in advisories from TWCERT/CC, available at https://www.twcert.org.tw/en/cp-139-10785-2cafe-2.html and https://www.twcert.org.tw/tw/cp-132-10784-4f67d-1.html. Security practitioners should consult these references for patch information, workarounds, or configuration changes to address the issue.