Is CVE-2026-27177 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-27177, but active exploitation has not been confirmed.

Can CVE-2026-27177 be exploited remotely?

Yes. CVE-2026-27177 is exploitable remotely over the network (CVSS attack vector: Network).

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

CVE-2026-27177 has a CVSS score of 7.2 (HIGH) and an EPSS exploitation probability of 0.03%.

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HIGHPOC

CVE-2026-27177

CWE-79Published: February 18, 2026· Updated: Feb 20, 2026

7.2

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.1th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-27177 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

A proof-of-concept (PoC) exploit exists for CVE-2026-27177. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.