CVE-2026-39842 — AI Deep Analysis Summary

🚨 **Essence**: OpenRemote < 1.22.0 suffers from **Expression Injection** in its rule engine. 📉 **Consequences**: Attackers can achieve **Remote Code Execution (RCE)** on the server, leading to total system compromise.

🛡️ **Root Cause**: **CWE-94** (Code Injection). The flaw lies in the **Rule Engine**, where two interrelated expressions are not properly sanitized, allowing malicious code injection.

🏢 **Affected**: **OpenRemote** IoT Platform. Specifically, all versions **prior to 1.22.0**. 📦 Component: The internal **Rule Engine** module.

💀 **Attacker Capabilities**: With access, hackers can execute **arbitrary code** on the server. This grants full control over the IoT platform, risking data theft, manipulation, or further lateral movement.

🔑 **Exploitation Threshold**: **Medium**. Requires **Low Complexity** and **Network** access. ⚠️ **Prerequisite**: Requires **Low Privileges** (PR:L) to exploit.…

📜 **Public Exploit**: **No**. The provided data shows an empty `pocs` array. While advisory links exist, no public Proof-of-Concept (PoC) or wild exploitation code is currently available.

🔍 **Self-Check**: Scan for **OpenRemote** instances running version **< 1.22.0**. Check if the **Rule Engine** is exposed and accessible. Look for version banners in HTTP headers or API responses.

✅ **Official Fix**: **Yes**. The vulnerability is fixed in **OpenRemote 1.22.0**. 📥 **Action**: Upgrade immediately to version 1.22.0 or later via the official GitHub releases.

🚧 **No Patch Workaround**: If upgrading is impossible, **restrict network access** to the Rule Engine. Enforce **strong authentication** and limit user privileges. Isolate the IoT platform from critical networks.

🔥 **Urgency**: **HIGH**. CVSS Score indicates **Critical** impact (C:H, I:H, A:H). Although auth is required, the ease of exploitation (AC:L) and severity of RCE make immediate patching essential.