CVE-2026-27177
HIGHCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
MajorDoMo (aka Major Domestic Module) contains a stored cross-site scripting (XSS) vulnerability via the /objects/?op=set endpoint, which is intentionally unauthenticated for IoT device integration. User-supplied property values are stored raw in the database without sanitization. When an administrator views the property editor in the admin panel, the stored values are rendered without escaping in both a paragraph tag (SOURCE field) and a textarea element (VALUE field). The XSS fires on page load without requiring any click from the admin. Additionally, the session cookie lacks the HttpOnly flag, enabling session hijack via document.cookie exfiltration. An attacker can enumerate properties via the unauthenticated /api.php/data/ endpoint and poison any property with malicious JavaScript.
Analysis
MajorDoMo's unauthenticated /objects/?op=set endpoint fails to sanitize property values, allowing remote attackers to inject stored XSS payloads that execute when administrators access the property editor, with public exploit code available. The vulnerability is compounded by session cookies lacking HttpOnly protection, enabling attackers to enumerate properties via the /api.php/data/ endpoint and hijack admin sessions through JavaScript exfiltration.
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Remediation
Within 24 hours: Identify all MajorDoMo deployments and assess exposure by cataloging which IoT devices interact with the /objects/?op=set endpoint. Within 7 days: Implement WAF rules to block malicious payloads on the endpoint and enable request logging; segment MajorDoMo instances from critical networks. …
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External POC / Exploit Code
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