CVE-2026-27175 — AI Deep Analysis Summary

🚨 **Essence**: MajorDoMo has a critical **OS Command Injection** flaw. 📉 **Consequences**: Attackers can execute arbitrary system commands, leading to full server compromise, data theft, and service disruption.…

🛡️ **Root Cause**: **CWE-78** (OS Command Injection). The flaw lies in `rc/index.php`. The `$param` variable is user-controlled and inserted directly into a command string inside double quotes without sanitization. 🐛

🏠 **Affected**: **MajorDoMo** (Open-source DIY smart home platform) by vendor **sergejey**. Specifically, the `rc/index.php` and `cycle_execs.php` components are vulnerable. Check your version! 📦

👑 **Attacker Power**: Full **OS-level privileges**. Since the queued commands are executed via `exec()` without auth, hackers can read/write files, install backdoors, or pivot to other network devices. 🕵️‍♂️

🔓 **Exploitation Threshold**: **LOW**. No authentication required (PR:N). Network accessible (AV:N). Low complexity (AC:L). The race condition allows bypassing potential checks. It’s an open door! 🚪

📢 **Public Exp?**: Yes. References include **VulnCheck Advisory** and **Chocapikk’s analysis**.…

🔍 **Self-Check**: Scan for MajorDoMo instances. Look for `rc/index.php` endpoints. Check if `cycle_execs.php` is accessible without auth. Use fuzzing tools to test for command injection via `$param` inputs. 🧪

🩹 **Official Fix**: **Yes**. A fix PR exists: **sergejey/majordomo#1177**. Update your platform immediately to the patched version. Don’t wait! 🏃‍♂️

🛑 **No Patch?**: **Mitigation**: Restrict network access to MajorDoMo ports. Implement WAF rules to block command injection patterns in `$param`. Disable `cycle_execs.php` if possible. Isolate the host! 🧱

🔥 **Urgency**: **CRITICAL**. CVSS Score is **9.1** (High). Unauthenticated, remote code execution. Patch immediately to prevent total system takeover. This is a top-priority fix! 🚨