Is this vulnerability remotely exploitable over the internet?

Yes. If `rc/index.php` and `cycle_execs.php` are reachable over the network (and especially if exposed to the internet), a remote attacker can exploit the issue without any credentials.

Does an attacker need authentication or a valid MajorDoMo account?

No. The described behavior occurs on web-accessible endpoints that do not enforce authentication, so exploitation only requires network access to the affected URLs.

What is the safest general fix pattern for this issue?

The most robust fix is to remove shell command construction from user-controlled data entirely—replace shell-based operations with direct PHP or API calls, or use non-shell execution APIs that take argument arrays and validate all inputs against strict allowlists.

Severity:

CRITICAL RISK

(9.8)

Unauthenticated OS Command Injection (CWE-78) in MajorDoMo rc/index.php Execution Pipeline

CVE-2026-27175

Published:

Feb 18, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Unauthenticated Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Unauthenticated Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Unauthenticated OS Command Injection (CWE-78) in MajorDoMo rc/index.php Execution Pipeline

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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