What is the CVSS score of CVE-2026-27177?

CVE-2026-27177 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of PHP are affected by CVE-2026-27177?

MajorDoMo contains a stored cross-site scripting vulnerability in an intentionally unauthenticated IoT integration endpoint, allowing attackers to inject malicious code that executes when users…

Is there a public PoC exploit available for CVE-2026-27177?

Yes, a public proof-of-concept exploit is available for CVE-2026-27177. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27177?

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. Within 30 days: Evaluate alternative vendors or community patches; establish input validation and output encoding at the application layer if vendor patch becomes available.

PHP CVE-2026-27177

HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-02-18 disclosure@vulncheck.com

PHP IoT XSS Majordomo

7.2

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.2 HIGH

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 20, 2026 - 20:00 vuln.today

Public exploit code

CVE Published

Feb 18, 2026 - 22:16 nvd

HIGH 7.2

DescriptionCVE.org

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.

Articles & Coverage 1

vulnerability.circl.lu MajorDoMo Multiple Critical RCE Vulnerabilities (CVE-2026-27174 to CVE-2026-27181) Feb 19, 2026

AnalysisAI

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.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Majordomo. 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 loa

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.