CVE-2026-27174

CriticalPublic PoCRCE

Published: 18 February 2026

Published

18 February 2026

Modified

20 February 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 0.8541 99.4th percentile

Risk Priority 71 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27174 is a critical-severity Code Injection (CWE-94) vulnerability in Mjdm Majordomo. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 0.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). 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 specific flaws: include order bug, missing exit after redirect, lack of authentication checks, and unsafe eval of user input from GET parameters.

AC-3 Access Enforcement good match

prevent

Enforces authentication and authorization to block unauthenticated remote access to the vulnerable admin panel ajax handler in inc_panel_ajax.php.

SI-10 Information Input Validation good match

prevent

Validates and sanitizes user-supplied GET parameters (ajax_panel, op, command) before processing to prevent arbitrary PHP code execution via eval.

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 →

Why these techniques?

The vulnerability allows unauthenticated remote code execution via a public-facing web application (admin panel), directly mapping to exploitation of public-facing applications.

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

NVD Description

MajorDoMo (aka Major Domestic Module) allows unauthenticated remote code execution via the admin panel's PHP console feature. An include order bug in modules/panel.class.php causes execution to continue past a redirect() call that lacks an exit statement, allowing unauthenticated requests to…

reach the ajax handler in inc_panel_ajax.php. The console handler within that file passes user-supplied input from GET parameters (via register_globals) directly to eval() without any authentication check. An attacker can execute arbitrary PHP code by sending a crafted GET request to /admin.php with ajax_panel, op, and command parameters.

Deeper analysisAI

CVE-2026-27174 is a critical remote code execution vulnerability in MajorDoMo (also known as Major Domestic Module), an open-source home automation platform. The flaw affects the admin panel's PHP console feature due to an include order bug in modules/panel.class.php, which allows execution to proceed past a redirect() call lacking an exit statement. This permits unauthenticated requests to reach the ajax handler in inc_panel_ajax.php, where user-supplied input from GET parameters is passed directly to eval() without authentication checks, exacerbated by the use of register_globals.

Any unauthenticated remote attacker can exploit this vulnerability by sending a crafted GET request to /admin.php with the ajax_panel, op, and command parameters containing arbitrary PHP code. Successful exploitation results in full remote code execution on the affected server, providing complete control over the system. The vulnerability has 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) and is classified under CWE-94 (Improper Control of Generation of Code).

Advisories and patches are available via referenced sources, including a detailed technical post at https://chocapikk.com/posts/2026/majordomo-revisited/, a fix pull request at https://github.com/sergejey/majordomo/pull/1177, and a VulnCheck advisory at https://www.vulncheck.com/advisories/majordomo-unauthenticated-remote-code-execution-via-admin-console-eval. Security practitioners should consult these for specific mitigation guidance, such as applying the upstream patch.